Anomalous dispersion of the acoustic mode in liquid Bi

M. Inui, Y. Kajihara, S. Munejiri, S. Hosokawa, A. Chiba, K. Ohara, S. Tsutsui, and A. Q. R. Baron
Phys. Rev. B 92, 054206 – Published 25 August 2015

Abstract

Inelastic x-ray scattering measurements on liquid Bi were carried out. Prominent acoustic mode excitations were observed in the dynamic structure factor to beyond 12nm1, which resolves previously conflicting results as to their presence beyond 6nm1. We find the dispersion curve of the excitation energy with momentum transfer is nearly flat from 7 to 15nm1 consistent with ab initio calculations of liquid Bi [J. Souto et al., Phys. Rev. B 81, 134201 (2010)]. Our ab initio and classical molecular dynamics simulations suggest that a long-range force is needed to reproduce the flatness of the dispersion curve, and the long-range force is correlated with a local structure consisting of shorter and longer bonds in the liquid.

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  • Received 14 September 2014
  • Revised 5 June 2015

DOI:https://doi.org/10.1103/PhysRevB.92.054206

©2015 American Physical Society

Authors & Affiliations

M. Inui1,*, Y. Kajihara1, S. Munejiri1, S. Hosokawa2, A. Chiba3, K. Ohara4, S. Tsutsui4, and A. Q. R. Baron4,5

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

  • *masinui@hiroshima-u.ac.jp

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Issue

Vol. 92, Iss. 5 — 1 August 2015

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