Low energy excitation in liquid Sb and liquid Bi observed in inelastic x-ray scattering spectra. (13th September 2021)

• Record Type: Journal Article
• Authors: Inui, M; Kajihara, Y; Hosokawa, S; Chiba, A; Nakajima, Y; Matsuda, K; Stellhorn, J R; Hagiya, T; Ishikawa, D; Uchiyama, H; Tsutsui, S; Baron, A Q R
• Is Part Of: Journal of physics. Volume 33:Number 47(2021)
• Publication Date: 2021-09-13
• Subjects: liquid metal -- Peierls distortion -- atomic dynamics -- transverse acoustic excitation -- inelastic x-ray scattering -- dynamic structure factor; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac216c
• Languages: English
• ISSNs: 0953-8984

Abstract

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.