Collective excitations in a melt of fast phase change material GeCu2Te3. (14th June 2023)

• Record Type: Journal Article
• Authors: Inui, M; Hosokawa, S; Tsutsui, S; Nakajima, Y; Matsuda, K; Maruyama, K; Baron, A Q R
• Is Part Of: Journal of physics. Volume 35:Number 23(2023)
• Publication Date: 2023-06-14
• Subjects: liquid GeCu2Te3 -- atomic dynamics -- fast phase change material -- inelastic x-ray scattering -- fast sound -- transverse acoustic mode; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/acc2ff
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Inelastic x-ray scattering measurements have been carried out to investigate atomic dynamics in a melt of fast phase change material GeCu2 Te3 . The dynamic structure factor was analysed using the model function with three damped harmonic oscillator components. By investigating the correlation between the excitation energy and the linewidth, and that between the excitation energy and the intensity on contour maps of a relative approximate probability distribution function proportional to exp ( − χ 2 / N ), we could judge the reliability of each inelastic excitation in the dynamic structure factor. The results indicate that there are two inelastic excitation modes besides the longitudinal acoustic one in the liquid. The lower energy excitation could be assigned to the transverse acoustic one whereas the higher energy one disperses like fast sound. The latter result may imply that the liquid ternary alloy exhibits a microscopic phase separation tendency.