Low energy excitation in liquid Sb and liquid Bi observed in inelastic x-ray scattering spectra

M. Inui, Y. Kajihara, S. Hosokawa, A. Chiba, Y. Nakajima, K. Matsuda, J. R. Stellhorn, T. Hagiya, D. Ishikawa, H. Uchiyama, S. Tsutsui, A. Q.R. Baron

Research output: Contribution to journalArticlepeer-review

Abstract

The dynamic structure factor S(Q, E), where Q and E are momentum and energy transfer, respectively, has been measured for liquid Sb, using inelastic x-ray scattering. A modified damped harmonic oscillator model function was applied to analyse S(Q, E) of liquid Sb and also to that of liquid Bi by Inui et al (2015 Phys. Rev. B 92, 054206). The obtained excitation energy was in fairly good agreement with that predicted by ab initio molecular dynamics simulations on these liquid semi-metals. The excitation energy of the longitudinal acoustic mode in liquid Sb and liquid Bi exhibits flat-topped Q dependence whereas the lower excitation energy below the longitudinal acoustic excitation shows Q-gap behaviour. From the viscosity estimated from the Q-gap experimentally obtained, it is inferred that the lower energy excitation arises from the transverse acoustic excitation in the liquids.

Original languageEnglish
Article number475101
JournalJournal of Physics Condensed Matter
Volume33
Issue number47
DOIs
Publication statusPublished - 2021 Nov 24

Keywords

  • atomic dynamics
  • dynamic structure factor
  • inelastic x-ray scattering
  • liquid metal
  • Peierls distortion
  • transverse acoustic excitation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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