Peculiar atomic dynamics in liquid GeTe with asymmetrical bonding: Observation by inelastic x-ray scattering

M. Inui, A. Koura, Y. Kajihara, S. Hosokawa, A. Chiba, K. Kimura, F. Shimojo, S. Tsutsui, and A. Q. R. Baron
Phys. Rev. B 97, 174203 – Published 14 May 2018

Abstract

Collective dynamics in liquid GeTe was investigated by inelastic x-ray scattering at 2Q31nm1. The dynamic structure factor shows clear inelastic excitations. The excitation energies at low Q disperse with increasing Q, consistent with the behavior of a longitudinal-acoustic excitation. The dispersion curve has a flat-topped region around the pseudo-Brillouin-zone boundary, similar to what is observed in liquid Bi [Inui et al., Phys. Rev. B 92, 054206 (2015)]. The dynamic structure factor shows a low-frequency excitation, and its coupling with the longitudinal-acoustic mode plays an important role for a flat-topped dispersion. From these results, it is inferred that atomic dynamics in liquid GeTe is strongly affected by a Peierls distortion similar to liquid Bi. By comparing the momentum transfer dependence of the excitation energy and quasielastic linewidth to partial structure factors obtained by our own ab initio molecular dynamics simulation for liquid GeTe, the quasielastic and inelastic components were found to be correlated with Te-Te and Ge-(Ge,Te) partial structure factors, respectively.

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  • Received 14 May 2017
  • Revised 28 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.174203

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsStatistical Physics & Thermodynamics

Authors & Affiliations

M. Inui1,*, A. Koura2, Y. Kajihara1, S. Hosokawa2, A. Chiba3, K. Kimura4,†, F. Shimojo2, S. Tsutsui5, and A. Q. R. Baron6

  • 1Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8521, Japan
  • 2Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
  • 3Department of Physics, Keio University, Yokohama 223-8522, Japan
  • 4Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 5Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
  • 6Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

  • *masinui@hiroshima-u.ac.jp
  • Present address: Nagoya Institute of Technology, Nagoya, Aichi 466-8555, Japan.

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Vol. 97, Iss. 17 — 1 May 2018

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