Scientific article
Open access

Diffuse scattering in metallic tin polymorphs

Published inJournal of physics. Condensed matter, vol. 26, no. 11, 115401
Publication date2014

The lattice dynamics of the metallic tin $\beta $ 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 $\beta $ -tin structure results in unusual asymmetry of thermal diffuse scattering. Strong resemblance of the diffuse scattering intensity distribution in $\beta $ 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 $\beta $ - and γ-tin at arbitrary momentum transfers. The combined approach delivers thus a complete picture of the lattice dynamics in harmonic description.

  • Lattice dynamics
  • Tin
  • Inelastic x-ray scattering
  • Thermal diffuse scattering
  • Ab initio lattice dynamics calculation
Affiliation Not a UNIGE publication
Citation (ISO format)
WEHINGER, Björn et al. Diffuse scattering in metallic tin polymorphs. In: Journal of physics. Condensed matter, 2014, vol. 26, n° 11, p. 115401. doi: 10.1088/0953-8984/26/11/115401
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Article (Published version)
ISSN of the journal0953-8984

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