Publications by authors named "Giuseppe Piccolboni"

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Diffuse scattering in metallic tin polymorphs.

J Phys Condens Matter 2014 Mar 3;26(11):115401. Epub 2014 Mar 3.

European Synchrotron Radiation Facility, BP 220 F-38043 Grenoble Cedex 9, France.

The lattice dynamics of the metallic tin β and γ polymorphs has been studied by a combination of diffuse scattering, inelastic x-ray scattering and density functional perturbation theory. The non-symmorphic space group of the β-tin structure results in unusual asymmetry of thermal diffuse scattering. Strong resemblance of the diffuse scattering intensity distribution in β and γ-tin were observed, reflecting the structural relationship between the two phases and revealing the qualitative similarity of the underlying electronic potential. The strong influence of the electron subsystem on inter-ionic interactions creates anomalies in the phonon dispersion relations. All observed features are described in great detail by the density functional perturbation theory for both β- and γ-tin at arbitrary momentum transfers. The combined approach delivers thus a complete picture of the lattice dynamics in harmonic description.
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March 2014