279 results match your criteria Chinese Journal Of Physics[Journal]


Magnetotransport Properties of Square-Net Compounds of NbSiSb and NbGeSb Single Crystals.

J Phys Condens Matter 2020 Jul 7. Epub 2020 Jul 7.

Shanghai Institute of Ceramics Chinese Academy of Sciences, Changning District, CHINA.

We successfully grew single crystals of Si- and Ge-square-net compounds of NbSiSb and NbGeSb whose excellent crystalline quality are verified using single-crystal x-ray diffraction -2 scans, rocking curves, scanning and transmission electron microscopies. Since these two compounds share major crystallographic similarity with the topological nodal-line semimetals of ZrSiS family, we employ density functional theory (DFT) calculations and magnetotransport measurements to demonstrate their band structures as well as the electron scattering mechanisms. DFT calculations show that the fermiology shows strong anisotropy from the crystallographic c-axis to the ab-plane and weak anisotropy within the ab plane, which is consistent with the strong anisotropic magnetotransport behaviors. Read More

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http://dx.doi.org/10.1088/1361-648X/aba385DOI Listing

Probing the anisotropy of Landau levels in phosphorene by magneto-capacitance with a parabolic potential confinement.

J Phys Condens Matter 2020 Jun 25. Epub 2020 Jun 25.

Department of Physics, Hunan Normal University, Department of Physics,, Hunan Normal University, PEOPLE'S REPUBLIC OF CHINA, Changsha, Hunan, 410081, CHINA.

We theoretically investigate the Landau Levels (LLs) and magneto-capacitance (MC) of monolayer black phosphorus under a perpendicular magnetic field, on which a parabolic potential is applied along with the armchair and zigzag directions, respectively. By both analytically perturbative calculation and numerical diagonalization based on an effective k · p Hamiltonian, we find that the LLs parabolically depend on the wave vectors and show strong anisotropy as the parabolic potential is applied along with different crystal directions. Specifically, the analytical LLs obtained by perturbative calculation from a decoupled single-band Hamiltonian are in good agreement with the numerical results. Read More

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http://dx.doi.org/10.1088/1361-648X/aba016DOI Listing

The non-Hermitian geometrical property of 1D Lieb lattice under Majorana's stellar representation.

J Phys Condens Matter 2020 Jun 24. Epub 2020 Jun 24.

Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang Province, 321004, CHINA.

The topological properties of non-Hermitian Hamiltonian is a hot topic, and the theoretical studies along this research line are usually based on the two-level non-Hermitian Hamiltonian (or, equivalently, a spin-$1/2$ non-Hermitian Hamiltonian). We are motivated to study the geometrical phases of a three-level Lieb lattice model (or, equivalently, a spin-$1$ non-Hermitian Hamiltonian) with the flat band in the context of a polariton condensate. The topological invariants are calculated by both winding numbers in the Brillouin zone and the geometrical phase of Majorana stars in the Bloch sphere. Read More

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http://dx.doi.org/10.1088/1361-648X/ab9fd4DOI Listing

Robust Majorana edge modes with low frequency multiple time periodic driving.

J Phys Condens Matter 2020 Apr 28;32(35):355404. Epub 2020 Apr 28.

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

Floquet Majorana edge modes capture the topological features of periodically driven p-wave superconductors. We present a Kitaev chain with multiple time periodic driving terms. Our results demonstrate how multiple driving will affect Floquet bands in frequency space, leading to more robust Floquet Majorana edge modes against driving frequency ω in comparison with the single driving scenario. Read More

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http://dx.doi.org/10.1088/1361-648X/ab8dddDOI Listing

Pressure effect on the magnetoresistivity of topological semimetal RhSn.

J Phys Condens Matter 2020 Apr 23;32(35):355601. Epub 2020 Apr 23.

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

RhSn is a topological semimetal with chiral fermions. At ambient pressure, it exhibits large positive magnetoresistance (MR) and field-induced resistivity upturn at low temperatures. Here we report on the electrical transport properties of RhSn single crystal under various pressures. Read More

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http://dx.doi.org/10.1088/1361-648X/ab8c8bDOI Listing

Numerical study of disorder on the orbital magnetization in two dimensions.

J Phys Condens Matter 2020 Apr 15;32(33):335302. Epub 2020 Apr 15.

SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People's Republic of China. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

The modern theory of orbital magnetization (OM) was developed by using Wannier function method, which has a formalism similar with the Berry phase. In this manuscript, we perform a numerical study on the fate of the OM under disorder, by using this method on the Haldane model in two dimensions, which can be tuned between a normal insulator or a Chern insulator at half filling. The effects of increasing disorder on OM for both cases are simulated. Read More

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http://dx.doi.org/10.1088/1361-648X/ab8985DOI Listing

Reversible control of magnetization in FeO nanoparticles by a supercapacitor.

J Phys Condens Matter 2020 Apr 14;32(33):334001. Epub 2020 Apr 14.

College of Physics Science, School of Electronic and Information Engineering, Qingdao University, Qingdao 266071, People's Republic of China. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

The manipulation of magnetism by electrical means is one of the most intensely pursued research topics of recent times aiming at the development of efficient and low-energy consumption devices in spintronics, microelectronics and bioelectronics. Herein, we successfully tuned the saturated magnetization of FeO by a supercapacitor. Through increasing the surface area of magnetic particles and activation of carbon cloth, fully reversible and robust saturation magnetization variation with low power consumption and remarkable switching speed can be realized on FeO/ionic liquid interfaces at room temperature. Read More

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http://dx.doi.org/10.1088/1361-648X/ab88f7DOI Listing

Quantum spin Hall state in monolayer 1T-TMDCs.

J Phys Condens Matter 2020 Apr 3;32(33):333001. Epub 2020 Apr 3.

State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China. CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, People's Republic of China.

Although the 1T phase is rare in the transition metal dichalcogenides (TMDCs) family, it has attracted rapid growing research interest due to the coexistence of superconductivity, unsaturated magneto-resistance, topological phases etc. Among them, the quantum spin Hall (QSH) state in monolayer 1T-TMDCs is especially interesting because of its unique van der Waals crystal structure, bringing advantages in the fundamental research and application. For example, the van der Waals two-dimensional (2D) layer is vital in building novel functional vertical heterostructure. Read More

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http://dx.doi.org/10.1088/1361-648X/ab8660DOI Listing

Superconductivity enhancement in FeSe/SrTiO: a review from the perspective of electron-phonon coupling.

J Phys Condens Matter 2020 Apr 2;32(34):343003. Epub 2020 Apr 2.

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Single-layer FeSe films grown on SrTiO, with the highest superconducting transition temperature (T ) among all the iron-based superconductors, serves as an ideal platform for studying the microscopic mechanisms of high-T superconductivity. The significant role of interfacial coupling has been widely recognized, while the precise nature of the T enhancement remains open. In this review, we focus on the investigations of the interfacial coupling in FeSe/SrTiO from the perspective of electron-phonon coupling (EPC). Read More

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http://dx.doi.org/10.1088/1361-648X/ab85f0DOI Listing

The giant planar Hall effect and anisotropic magnetoresistance in Dirac node arcs semimetal PtSn.

J Phys Condens Matter 2020 Apr 1;32(31):315702. Epub 2020 Apr 1.

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, People's Republic of China. University of Science and Technology of China, Hefei, 230026, People's Republic of China.

Topological semimetals (TSMs) present intriguing quantum states and have attracted much attention in recent years because of exhibiting various anomalous magneto-transport phenomena. Theoretical prediction shows that some novel phenomena, such as negative magnetoresistance (MR) and the planar Hall effect (PHE), originate from the chiral anomaly in TSMs. In this work, high-field (33 T) Shubnikov-de Haas (SdH) oscillations are obtained to reveal the topology of PtSn. Read More

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http://dx.doi.org/10.1088/1361-648X/ab851fDOI Listing

Topological evolution of correlated band structures and heavy-fermion-like behavior in a molybdenum-based metal organic framework CSMo.

J Phys Condens Matter 2020 Mar 17;32(29):295503. Epub 2020 Mar 17.

Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, People's Republic of China.

Owing to the fascinating properties of two dimensional transition metal dichalcogenides and the stability of ZIF-8 as the subclass of metal organic frameworks (MOFs), we propose a Mo-based MOFs material CSMo containing organic ligands [Formula: see text] connecting to each other by Mo metal ions. We reveal heavy-fermion-like electronic behaviour that results from highly localized impurity-like Mo-d electrons and tiny energy difference (<0.4 meV/atom) between antiferromagnetic and ferromagnetic state, using the generalized gradient approximation and its combination with Coulomb correlation U. Read More

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http://dx.doi.org/10.1088/1361-648X/ab8090DOI Listing

Topological supersolidity of dipolar Fermi gases in a spin-dependent optical lattice.

J Phys Condens Matter 2020 Feb 20;32(23):235701. Epub 2020 Feb 20.

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing100190, People's Republic of China.

We investigate the topological supersolid states of dipolar Fermi gases trapped in a spin-dependent 2D optical lattice. Our results show that topological supersolid states can be achieved via the combination of topological superfluid states with the stripe order. Different from the general held belief that supersolid state in fermionic system can only survive with simultaneous coexistence of the repulsive and attractive dipolar interaction. Read More

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http://dx.doi.org/10.1088/1361-648X/ab7871DOI Listing
February 2020

Scaling of the magnetic entropy change in chiral helimagnetic YbNiAl.

J Phys Condens Matter 2020 Jan 22;32(19):195801. Epub 2020 Jan 22.

Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. University of Science and Technology of China, Hefei 230026, People's Republic of China.

Generally, magnetic anisotropy is a common feature of a layered magnetic material, the exploration of which plays a key role in understanding the intrinsic magnetic couplings. In this work, we have studied the field-induced magnetic transitions for layered YbNiAl as the external magnetic field is applied perpendicularly ([Formula: see text]) and parallel (H//c) to the c-axis. We find that two independent universal curves of magnetic entropy change [[Formula: see text]] can be fitted out for [Formula: see text] and H//c, respectively. Read More

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http://dx.doi.org/10.1088/1361-648X/ab6e8fDOI Listing
January 2020
2.346 Impact Factor

Anomalous lattice stiffening in tungsten tetraboride solid solutions with manganese under compression.

J Phys Condens Matter 2020 Jan 7;32(16):165702. Epub 2020 Jan 7.

Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Tungsten tetraboride (WB)-based solid solutions represent one of the most promising superhard metal candidates; however, their underlying hardening mechanisms have not yet been fully understood. Here, we explore the lattice compressibility of WB binary solid solutions with different manganese (Mn) concentrations using high-pressure x-ray diffraction (XRD) up to 52 GPa. Under initial compression, the lattices of low and high Mn-doped WB alloys (i. Read More

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http://dx.doi.org/10.1088/1361-648X/ab6868DOI Listing
January 2020

Anomalous low temperature magnetic properties in bulk magnetite.

Authors:
X H Liu Z P Zhou

J Phys Condens Matter 2019 Dec 19;32(15):155804. Epub 2019 Dec 19.

State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

We systematically investigated the magnetic properties of a single crystal bulk FeO at low temperatures. Below Verwey transition, the magnetization versus temperature curves under zero-field cooling present anomalous behaviors for [1 0 0], [1 0 1] and [0 0 1] directions, respectively. Furthermore, at Verwey temperature, a high sensitivity of relative magnetization change (ΔM/M) to small magnetic field and, in particular, a reversal of ΔM/M at moderate magnetic field range for [0 0 1] direction is observed. Read More

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http://dx.doi.org/10.1088/1361-648X/ab63e4DOI Listing
December 2019

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-CoGe.

J Phys Condens Matter 2019 Dec 17;32(15):155802. Epub 2019 Dec 17.

Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China. University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

The physical properties of itinerant ferromagnet [Formula: see text]-CoGe with both strong disorder and spin fluctuations was studied. The dc and ac susceptibility show that both spin fluctuations and disorder dominate the physical properties. In the spin glass phase, with a coexisting ferromagnetic state ([Formula: see text]30 K), both non-Fermi liquid behavior and large exponent of scaling relation of [Formula: see text] are observed and attributed to the spin fluctuations and disorder induced by cobalt defects. Read More

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http://dx.doi.org/10.1088/1361-648X/ab62beDOI Listing
December 2019
2.346 Impact Factor

Structural, mechanical and electronic properties of two-dimensional chlorine-terminated transition metal carbides and nitrides.

J Phys Condens Matter 2019 Dec 11;32(13):135302. Epub 2019 Dec 11.

Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, People's Republic of China.

Two-dimensional transition metal carbides and nitrides (MXenes) have attracted intensive attention since 2011, and surface groups have been determined to show a key role in MXene properties. Recently, an emerging functional group of chlorine was realized in MXenes, such as in TiCCl and TiCCl. In order to understand and apply MXenes terminated by this type functional group, the structural, mechanical and electronic properties of MXCl and MXCl (M  =  Sc, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W; X  =  C, N) are investigated in this work from first-principles theory. Read More

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http://dx.doi.org/10.1088/1361-648X/ab6048DOI Listing
December 2019

Boron-dopant enhanced stability of diamane with tunable band gap.

J Phys Condens Matter 2019 Dec 5;32(13):135503. Epub 2019 Dec 5.

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. University of Science and Technology of China, Hefei 230026, People's Republic of China.

The structural, electronic, and superconducting properties of B-doped cubic and hexagonal diamane (single layer diamond) were investigated based on the first-principles methods. B atom tends to stay in the substitutional site, and the most stable configuration is the structure with vertical B-B dimer. The formation energy of B-doped diamane is lower than the counterpart of pristine diamane indicating that B dopant can facilitate the synthesis of diamane. Read More

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http://dx.doi.org/10.1088/1361-648X/ab5f37DOI Listing
December 2019

Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications.

J Phys Condens Matter 2019 Nov 5;32(14):143001. Epub 2019 Nov 5.

School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, People's Republic of China.

The field of magnetic skyrmions has been actively investigated across a wide range of topics during the last decades. In this topical review, we mainly review and discuss key results and findings in skyrmion research since the first experimental observation of magnetic skyrmions in 2009. We particularly focus on the theoretical, computational and experimental findings and advances that are directly relevant to the spintronic applications based on magnetic skyrmions, i. Read More

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http://dx.doi.org/10.1088/1361-648X/ab5488DOI Listing
November 2019

High-pressure synthesis and spin glass behavior of a Mn/Ir disordered quadruple perovskite CaCuMnIrO.

J Phys Condens Matter 2020 Feb 1;32(7):075701. Epub 2019 Nov 1.

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

A new 3d-5d hybridized quadruple perovskite oxide, CaCuMnIrO, was synthesized by high-pressure and high-temperature methods. The Rietveld structure analysis reveals that the compound crystallizes in an [Formula: see text]-type perovskite structure with space group Im-3, where the Ca and Cu are 1:3 ordered at fixed atomic positions. At the B site the 3d Mn and the 5d Ir ions are disorderly distributed due to the rare equal  +4 charge states for both of them as determined by x-ray absorption spectroscopy. Read More

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http://dx.doi.org/10.1088/1361-648X/ab5386DOI Listing
February 2020

Carrier free long-range magnetism in Mo doped one quintuple layer BiTe and SbTe.

J Phys Condens Matter 2020 Jan 11;32(6):065801. Epub 2019 Sep 11.

Beijing Computational Science Research Center, Beijing 100193, People's Republic of China. Department of Physics, Chinese University of Hong Kong, Hong Kong, People's Republic of China.

One of the keys to the realization of quantum anomalous Hall effect is long range ferromagnetism, which is only experimentally realized in Cr or V doped (Bi,Sb)Te system. Both elements are 3d transition metals, and 4d transition metals are found to be ineffective to produce long range ferromagnetism in BiSe. Still, whether long range ferromagnetism can be realized by magnetic doping of 4d elements is an open question. Read More

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http://dx.doi.org/10.1088/1361-648X/ab43a5DOI Listing
January 2020

Robust generation of half-metallic transport and pure spin current with photogalvanic effect in zigzag silicene nanoribbons.

J Phys Condens Matter 2019 Dec 22;31(49):495701. Epub 2019 Aug 22.

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. University of Science and Technology of China, Hefei 230026, People's Republic of China.

Using first-principles density functional theory combined with non-equilibrium Green's function method, we investigate the spin-dependent current generated by photogalvanic effect (PGE) in photoelectric devices based on zigzag silicence nanoribbons with unsymmetrical sp -sp hydrogen passivated edges (H-2H ZSiNRs) and C symmetry. Due to their unique atomic structures and spin-semiconductor properties, we find that the flow direction of different spin channels, spin polarization and magnitude of the photocurrent can be efficiently controlled by tuning the photon energy ([Formula: see text]) or polarization/helicity angle ([Formula: see text]) of the incident polarized light. Interestingly, at certain polarization/helicity angles or certain photon energy, 100% spin polarized current can be achieved by either linearly or elliptically polarized light. Read More

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http://dx.doi.org/10.1088/1361-648X/ab3dd6DOI Listing
December 2019
2.346 Impact Factor

Multiple gaps revealed by low temperature specific heat in the 1111-type CaFeCoAsF single crystals.

J Phys Condens Matter 2019 Nov 25;31(45):455602. Epub 2019 Jul 25.

State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China. CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Low-temperature specific heat (SH) is measured on the 1111-type CaFe CoAsF single crystals under different magnetic fields. A clear SH jump with the height [Formula: see text] mJ mol K is observed at the superconducting transition temperature T . The electronic SH coefficient [Formula: see text] increases linearly with the field below 5 T and a kink is observed around 5 T, indicating a multi-gap feature in the present system. Read More

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http://dx.doi.org/10.1088/1361-648X/ab34b8DOI Listing
November 2019
5 Reads
2.346 Impact Factor

Dark-field spectroscopy: development, applications and perspectives in single nanoparticle catalysis.

J Phys Condens Matter 2019 Nov 17;31(47):473001. Epub 2019 Jul 17.

School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, People's Republic of China. Division of Advanced Nanomaterials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123, People's Republic of China.

Dark-field microscopy (DFM) is an effective method to detect the scattering signal from single nanoparticles. This technique could break through the 200 nm limit resolution of ordinary optical microscopes. It even can observe the submicron particles of 20-200 nm. Read More

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http://dx.doi.org/10.1088/1361-648X/ab330aDOI Listing
November 2019
1 Read

Electronic behaviors during martensitic transformations in all-d-metal Heusler alloys.

J Phys Condens Matter 2019 Oct 21;31(42):425401. Epub 2019 Jun 21.

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

For solid-state phase transitions, the alterations of electronic structure driven by the band Jahn-Teller effect would play an essential role in the structural phase transitions and in switching the resistivity or magnetization states for potential applications. However, this evolution of the electronic structure and electronic transport during the martensitic transformations (MT) still lacks comprehensive investigations, especially in magnetic martensitic materials studied in recent years. In this work, we report a study on the electronic behaviors during the MT in a kind of all-d-metal Ni Fe MnTi Heusler magnetic shape memory alloys, by combining x-ray diffraction, calorimetric, magnetic, transport measurements and calculations. Read More

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http://dx.doi.org/10.1088/1361-648X/ab2bd8DOI Listing
October 2019
21 Reads

Predictions of the structures and properties of the substituted layered ternary compound series (Zr T )AlC (T  =  Hf, Nb, and V) through first-principles studies.

J Phys Condens Matter 2019 Sep 12;31(38):385702. Epub 2019 Jun 12.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, Jilin, People's Republic of China. Engineering Laboratory of Specialty Fibers and Nuclear Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, People's Republic of China.

The (Zr T )AlC (T  =  Hf, Nb, and V) series can be potential candidates to extend the domain of MAX phases. In this work, the structures and properties of (Zr T )AlC (T  =  Hf, Nb, and V) are studied using first-principles calculations. The obtained structural parameters are in good accordance with previously reported data in the literature. Read More

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http://dx.doi.org/10.1088/1361-648X/ab2952DOI Listing
September 2019
22 Reads
2.346 Impact Factor

Poisson-Boltzmann theory with non-linear ion correlations.

J Phys Condens Matter 2019 Sep 24;31(35):355101. Epub 2019 May 24.

CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, PO Box 2735, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, People's Republic of China. Computational Mathematics Group, Pacific Northwest National Laboratory, Richland, WA 99352, United States of America.

The Poisson-Boltzmann (PB) theory is widely used to depict ionic systems. As a mean-field theory, the PB theory neglects the correlation effect in the ionic atmosphere and leads to deviations from experimental results as the concentration or charge valance increases. A modified PB theory including ion correlation effect while retaining its simplicity is critical for many important applications in which ion correlation effect can be significant. Read More

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http://dx.doi.org/10.1088/1361-648X/ab24a9DOI Listing
September 2019
2 Reads

Optical determination of spin diffusion length and interfacial spin mixing conductance in epitaxial Pd/Fe bilayers.

J Phys Condens Matter 2019 Jul 17;31(30):305802. Epub 2019 Apr 17.

State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

We present a detailed study of the photoinduced magnetization precession and magnetic relaxation in epitaxial Pd/Fe films on MgO(0 0 1) substrates via all-optical pump-probe techniques. We explicitly formulate the correlation between the Gilbert damping and the effective damping in the optical approach. Furthermore, a non-local Gilbert damping induced by spin pumping is demonstrated self-consistently by the Gilbert damping dependence on Pd thickness and the [Formula: see text] relationship of damping with Fe thickness [Formula: see text]. Read More

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http://iopscience.iop.org/article/10.1088/1361-648X/ab1a99
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http://dx.doi.org/10.1088/1361-648X/ab1a99DOI Listing
July 2019
21 Reads
2.346 Impact Factor

Spontaneous dewetting of a hydrophobic micro-structured surface.

J Phys Condens Matter 2019 Jul 15;31(29):295001. Epub 2019 Apr 15.

LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Inspired by recent experimental observations and natural phenomena that spontaneous dewetting transition occurs on a hydrophobic micro-structured surface, a thermodynamic model of a condensed water droplet on a micro-pillar arrayed surface is established in order to disclose the mechanical mechanism. Based on a general model of an arbitrary-shaped micro-structured surface, surfaces with conical, rectangular and parabolic micro-pillars are investigated. A critical water droplet volume is found, beyond which dewetting transition can be realized. Read More

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http://dx.doi.org/10.1088/1361-648X/ab1998DOI Listing

Broken cubic symmetry driven co-emergence of type-I and type-II Dirac points in topological crystalline insulator ThTaN.

J Phys Condens Matter 2019 Jul 9;31(29):295501. Epub 2019 Apr 9.

College of Physics and Materials Science, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, People's Republic of China.

ThTaN is known as a rare cubic perovskite nitride topological crystalline insulator (TCI). Here, we propose, using first-principles calculations, that compressive uniaxial (0 0 1) strained ThTaN can host a three dimensional nodal-chain semimetal state when spin-orbit coupling (SOC) is ignored. When SOC is turned on, the nodal-chain is gapped out, resulting in a pair of type-II Dirac points as protected by C crystal symmetry. Read More

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http://dx.doi.org/10.1088/1361-648X/ab17a2DOI Listing
July 2019
3 Reads

Interface induced enhancement of inverse spin Hall voltage in NiFe/Pt bilayers capped by MgO layer.

J Phys Condens Matter 2019 Jul 8;31(28):285801. Epub 2019 Apr 8.

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China. Dongguan Neutron Science Center, Dongguan 523803, People's Republic of China.

In ferromagnet/heavy metal bilayers, a spin current can be generated under the ferromagnetic resonance (FMR) condition, and then converted into a charge current in adjacent nonmagnetic metals through inverse spin Hall effect (ISHE). Here, we report an experimental observation of interface induced ISHE enhancement in NiFe/Pt bilayers covered by MgO layer. Compared to bare NiFe/Pt bilayers, Pt/MgO interface induces an enhancement of the spin-charge conversion in the NiFe/Pt/MgO trilayers with very thin Pt layers, in agreement with the corresponding trend of Gilbert damping enhancement. Read More

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http://dx.doi.org/10.1088/1361-648X/ab172aDOI Listing

Magnetism study on a triangular lattice antiferromagnet Cu(OH)Br.

J Phys Condens Matter 2019 Jul 4;31(27):275801. Epub 2019 Apr 4.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China.

Magnetism of Cu(OH)Br single crystals based on a triangular lattice is studied by means of magnetic susceptibility, pulsed-field magnetization, and specific heat measurements. There are two inequivalent Cu sites in an asymmetric unit. Both Cu sublattices undergo a long-range antiferromagnetic (AFM) order at [Formula: see text] K. Read More

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http://iopscience.iop.org/article/10.1088/1361-648X/ab1623
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http://dx.doi.org/10.1088/1361-648X/ab1623DOI Listing
July 2019
8 Reads

Magnetic and transport properties of Zr Nb CoSn.

J Phys Condens Matter 2019 Jul 4;31(27):275702. Epub 2019 Apr 4.

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

ZrCoSn is a potential candidate as a Weyl semimetal with a ferromagnetic ground state, and Nb-doping is expected to shift the Weyl points to the vicinity of Fermi level. We successfully synthesized a series of Zr Nb CoSn single crystals with various concentrations of Nb (x  =  0, 0.1, 0. Read More

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http://iopscience.iop.org/article/10.1088/1361-648X/ab161e
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http://dx.doi.org/10.1088/1361-648X/ab161eDOI Listing
July 2019
19 Reads

Bandgap engineering of PbTe ultra-thin layers by surface passivations.

J Phys Condens Matter 2019 Jul 29;31(29):295503. Epub 2019 Mar 29.

SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, 100083 Beijing, People's Republic of China. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, 100049 Beijing, People's Republic of China.

We calculate the electronic structures of the PbTe (1 1 1) ultra-thin films by performing the first-principles calculations. The PbTe (1 1 1) ultra-thin films possess direct or indirect band gaps depending sensitively on surface passivations with hydrogen or halogen atoms, and the band gaps depend sensitively on the passivation elements. The bandgaps of PbTe (1 1 1) ultra-thin films with hydrogen passivations can be tuned from 15 meV to 65 meV by applying external strains, making PbTe ultra-thin films promising candidates for optoelectronic device applications in terahertz regime. Read More

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http://dx.doi.org/10.1088/1361-648X/ab14acDOI Listing
July 2019
1 Read

Pressure-induced phase transitions and structural evolution across the insulator-metal transition in bulk and nanoscale BiFeO.

J Phys Condens Matter 2019 Jul 28;31(26):265404. Epub 2019 Mar 28.

Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

The pressure-induced phase-transition sequences and structural evolution across the insulator-metal transition (IMT) in multiferroic BiFeO still remain unclear. Here we use a combination of high-pressure XRD, XAFS experiment and first principle calculation to investigate the pressure-derived structural transformations and structure-related properties in bulk and nanoscale BiFeO up to 55 GPa. A new Imma structure of BiFeO has been discovered in the pressure range of 48-52 GPa, which presents ferromagnetic (FM) metallic properties and therefore plays a key role in the IMT. Read More

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http://dx.doi.org/10.1088/1361-648X/ab1469DOI Listing
July 2019
6 Reads

Recovery of photoexcited magnetic ordering in SrIrO.

J Phys Condens Matter 2019 Jun 21;31(25):255801. Epub 2019 Mar 21.

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physics, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

The recovery of antiferromagnetic and lattice order of SrIrO upon laser excitation was measured by time-resolved x-ray diffraction on nanosecond time scales. The in situ measurements of both magnetic and lattice order parameters allow direct comparison of their time evolutions without ambiguity. We found that the magnetic order recovers with two time constants. Read More

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http://stacks.iop.org/0953-8984/31/i=25/a=255801?key=crossre
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http://dx.doi.org/10.1088/1361-648X/ab123dDOI Listing
June 2019
21 Reads
2.346 Impact Factor

Stability of pyridine-like and pyridinium-like nitrogen in graphene.

J Phys Condens Matter 2019 Jul 20;31(26):265403. Epub 2019 Mar 20.

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, People's Republic of China.

Identification of N configurations in N-doped graphene is important to improve its functionalities. In most experiments, graphite-like, pyridine-like, and pyrrole-like N was usually chosen to assign the spectral features of N-doped graphene. Based on the first-principles simulations, we find that since one of nitrogen's electrons occupies the LUMO state, stability of pyridinium-like N (pyridine-like N with hydrogen termination) in multi-benzenes systems increases with the HOMO-LUMO gap decreasing. Read More

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http://dx.doi.org/10.1088/1361-648X/ab11a8DOI Listing

Large magnetoresistance effects in FeO.

J Phys Condens Matter 2019 Jun 5;31(22):225803. Epub 2019 Mar 5.

Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China.

We investigated the magnetoresistance (MR) of a single crystal of magnetite, FeO. In an effort to distinguish between different contributions to the MR the samples were prepared in two different initial magnetic states, i.e. Read More

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http://dx.doi.org/10.1088/1361-648X/ab0cf4DOI Listing
June 2019
31 Reads

Na-doping effects on structural evolution and superconductivity in (K Na )CrAs (x  =  0-1).

J Phys Condens Matter 2019 Jun 28;31(22):225701. Epub 2019 Feb 28.

Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

In this report, we studied the effects of isovalent Na-doping on the recently discovered quasi-one-dimensional Cr-based unconventional superconductor KCrAs. A series of polycrystalline samples with nominal component (K Na )CrAs (x  =  0-1) were synthesized by the solid state reaction method. From crystal structure and chemical phase characterizations, we found two distinct chemical phases with the same hexagonal structure but distinguished by different site occupancy of Na ions at the two kinds of K-site in the KCrAs lattice structure. Read More

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http://dx.doi.org/10.1088/1361-648X/ab0b94DOI Listing
June 2019
5 Reads

Recovery of the Dirac states of graphene by intercalating two-dimensional traditional semiconductors.

J Phys Condens Matter 2019 May 8;31(19):194001. Epub 2019 Feb 8.

Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

The epitaxial growth of graphene on transition-metal substrates has proved to be an efficient method to synthesize high-quality large-area graphene. However, due to the interaction between graphene and the transition-metal substrate, the electronic structure of the as-fabricated graphene is distorted. Here, using density functional theory calculations, we investigated the effect of intercalating two-dimensional (2D) silicon and III-V materials, such as double-layer honeycomb AlAs, into the graphene-metal interface. Read More

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http://iopscience.iop.org/article/10.1088/1361-648X/ab05a6
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http://dx.doi.org/10.1088/1361-648X/ab05a6DOI Listing
May 2019
7 Reads

Multiferroicity and magnetoelectric coupling in the paramagnetic state of the metal-organic framework [(CH)NH]Ni(HCOO).

J Phys Condens Matter 2019 May 1;31(20):205701. Epub 2019 Feb 1.

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

The metal-organic framework [(CH)NH]Ni(HCOO) (DMA-Ni) has an ABX perovskite-like structure. At T ~ 181 K, DMA-Ni displays a first-order ferroelectric transition, which is triggered by the disorder-order transition of hydrogen bonds. In addition, this compound exhibits a spin-canted antiferromagnetic order below T ~ 37. Read More

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http://dx.doi.org/10.1088/1361-648X/ab03efDOI Listing
May 2019
32 Reads

Critical phenomenon and phase diagram of Mn-intercalated layered MnNbS.

J Phys Condens Matter 2019 May 15;31(19):195803. Epub 2019 Jan 15.

Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. University of Science and Technology of China, Hefei 230026, People's Republic of China.

The magnetization of Mn-intercalated layered MnNbS single crystal has been systematically investigated. The angle-dependent magnetization ([Formula: see text], [Formula: see text], and [Formula: see text]) displays that the magnetization of MnNbS with [Formula: see text] is much stronger than that with H//c, but no magnetic anisotropy within the ab-plane. In addition, a field-induced magnetic phase transition is found when [Formula: see text]. Read More

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http://iopscience.iop.org/article/10.1088/1361-648X/aafebc
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http://dx.doi.org/10.1088/1361-648X/aafebcDOI Listing
May 2019
45 Reads
2.346 Impact Factor

Effect of pressure on the self-hole-doped superconductor RbGdFeAsO.

J Phys Condens Matter 2019 01 30;31(4):044001. Epub 2019 Jan 30.

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

RbGdFeAsO is a newly discovered self-hole-doped stoichiometric superconductor, which has a hybrid structure with separated double FeAs layers and exhibits a high superconducting transition temperature T   =  35 K. Here, we report the effect of pressure (P) on its T and normal-state transport properties by measuring the temperature dependence of resistivity ρ(T) under various pressures up to 14 GPa with a cubic anvil cell apparatus. We found that the T is suppressed monotonically to ca. Read More

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http://dx.doi.org/10.1088/1361-648X/aaf0b9DOI Listing
January 2019

Local insight into the La-induced structural phase transition in multiferroic BiFeO ceramics by x-ray absorption fine structure spectroscopy.

J Phys Condens Matter 2019 Feb 5;31(8):085402. Epub 2018 Dec 5.

Beijing Synchrotron Radiation Facility, Istitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Substitution of bismuth by rare earth (RE) ions is of great technological importance to develop room-temperature BiFeO-based multiferroic materials. Despite this interest, many fundamental properties and the structure-property correlations of RE-doped BiFeO remain poorly understood. Here we report a systematical experimental and theoretical exploration on the structural phase transition in Bi La FeO (0  ⩽  x  ⩽  0. Read More

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http://stacks.iop.org/0953-8984/31/i=8/a=085402?key=crossref
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http://dx.doi.org/10.1088/1361-648X/aaf658DOI Listing
February 2019
4 Reads

Surface states of gapped electron systems and semi-metals.

J Phys Condens Matter 2018 Nov 3;30(46):465503. Epub 2018 Oct 3.

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. Beijing Key Laboratory for Advanced Functional Materials and Structure Research, Beijing 100190, People's Republic of China.

With a generic lattice model for electrons occupying a semi-infinite crystal with a hard surface, we study the eigenstates of the system with a bulk band gap (or the gap with nodal points). The exact solution to the wave functions of scattering states is obtained. From the scattering states, we derive the criterion for the existence of surface states. Read More

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http://dx.doi.org/10.1088/1361-648X/aae5ecDOI Listing
November 2018
1 Read

Phase diagram of the incommensurate off-diagonal Aubry-André model with p-wave pairing.

Authors:
Xiaoming Cai

J Phys Condens Matter 2018 Aug 17;30(34):345601. Epub 2018 Jul 17.

State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China.

Using exact numerical methods, we study the interplay between p-wave superconductivity and off-diagonal modulation in the incommensurate off-diagonal Aubry-André model with p-wave pairing. When chemical potential is zero, the modulation not only leads to an Anderson-like localization with all bulk states changing into critical ones, but also induces a topological phase transition accompanying the disappearing of exponentially localized zero-energy edge Majorana fermions. These two transitions happen at different places and true Anderson localization is absent. Read More

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http://dx.doi.org/10.1088/1361-648X/aad3efDOI Listing
August 2018
7 Reads

Perfectly conducting graphene electronic waveguide with curved channels.

J Phys Condens Matter 2018 Aug 28;30(32):325301. Epub 2018 Jun 28.

CAS Key Laboratory of Quantum Information, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, People's Republic of China.

We theoretically investigate the electronic transport properties of curved graphene waveguides by employing non-equilibrium Green's function techniques. We systematically study the dependence of the confined waveguide modes on the potential difference, the width of waveguide and side barrier. Through two-terminal electronic transport calculations, we show that the conductance of confined waveguide modes is rather robust against the bending degree of waveguide, in consistence with the band insensitivity to the side barrier. Read More

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http://dx.doi.org/10.1088/1361-648X/aacfcaDOI Listing
August 2018
2 Reads

Effects of vacancy defects on Fe properties incorporated in MgO.

J Phys Condens Matter 2018 Jul 6;30(29):295701. Epub 2018 Jun 6.

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. University of Science and Technology of China, Hefei 230026, People's Republic of China. Beijing Computational Science Research Center, Beijing 100084, People's Republic of China.

Distributions of Fe in MgO containing Mg vacancy, O vacancy, and Schottky defect are investigated based on the density functional theory (DFT). Our results show that since Mg vacancy will remove electrons from MgO, Fe tends to get close to Mg vacancy but far from O vacancy. The Mg vacancy can decrease the magnetic moment of iron and change its valence state from 2+  to 3+, which leads to ~5% decrease of Fe-O bond length comparable to the effect of 30 GPa external pressure. Read More

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http://stacks.iop.org/0953-8984/30/i=29/a=295701?key=crossre
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http://dx.doi.org/10.1088/1361-648X/aacabdDOI Listing
July 2018
6 Reads

An efficient mechanism for enhancing the thermoelectricity of nanoribbons by blocking phonon transport in 2D materials.

J Phys Condens Matter 2018 Jul 25;30(27):275701. Epub 2018 May 25.

Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China. Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China.

Inspired by the novel mechanism of reducing thermal conductivity by local phonon resonance instead of by inducing structural defects, we investigate the effect of side branching on the thermoelectric properties of [Formula: see text] nanoribbons, and prove that side branching is a highly efficient mechanism for enhancing the thermoelectricity of different kinds of nanoribbons. For both armchair and zigzag [Formula: see text] nanoribbons, the side branches result in not only significant blocking of phonon transport but also notable increase of the Seebeck coefficient. Consequently, the thermoelectric figure of merit of the armchair [Formula: see text] nanoribbon is boosted from 0. Read More

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http://stacks.iop.org/0953-8984/30/i=27/a=275701?key=crossre
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http://dx.doi.org/10.1088/1361-648X/aac7f5DOI Listing
July 2018
5 Reads

Competing spin fluctuations and trace of vortex dynamics in the two-dimensional triangular-lattice antiferromagnet AgCrS.

J Phys Condens Matter 2018 Jul 18;30(26):265802. Epub 2018 May 18.

The Anhui Key Laboratory of Condensed Mater Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China. University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

The spin dynamics of the two-dimensional triangular-lattice antiferromagnet AgCrS is investigated by electron spin resonance (ESR) spectroscopy. The g-factor is found to show an unusual non-monotonously temperature dependent behavior, which, along with the super-Curie behavior observed in the ESR intensity data, provides clear evidence for the competition between ferromagnetic and antiferromagnetic fluctuations at temperatures well above T . On approaching the Néel temperature T from above, the linewidth is found to diverge. Read More

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http://dx.doi.org/10.1088/1361-648X/aac622DOI Listing
July 2018
12 Reads