This article is cited in 19 papers

CONDENSED MATTER

Dynamic structure factor in liquid cesium on the basis of time-scale invariance of relaxation processes

R. M. Yul'met'yev^a, A. V. Mokshin^a, P. Hänggi^b, V. Yu. Shurygin<sup>c

a</sup> Kazan State Pedagogical University
^b University of Augsburg
^c Elabuga State Pedagogical Institute

Abstract: The dynamic structure factor $S(k,\omega)$ in liquid cesium near the melting point at $T=308\,$K is studied by means of Zwanzig–Mori's memory function formalism. The spectra of $S(k,\omega)$ are calculated on the basis of the idea of time-scale invariance of relaxation processes in liquid metals, which appeared on the fourth relaxation level. The obtained spectra of $S(k,\omega)$ are compared with the results of the inelastic neutron scattering measurement. For the description of memory effects we use the statistical presentation about the non-Markovity parameter $\varepsilon_{1}(k,\omega)$. We find that collective excitations at the low wave vector values have a non-Markovian nature.

PACS: 61.12.-q, 61.20.-p, 67.40.Fd

Received: 07.06.2002

Language: English

 English version: Journal of Experimental and Theoretical Physics Letters, 2002, 76:3, 147–150

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