Nonresonant acoustic absorption of Ising magnet

I. S. Donskaya^a, A. R. Kessel^a, S. S. Lapushkin<sup>b

a</sup> Zavoisky Physical Technical Institute, Kazan Scientific Center of the Russian Academy of Sciences
^b Moscow Institute of Instrument Engineering

Abstract: Zubarev's nonequilibrium statistical operator method is used to construct a theory of the nonresonant acoustic absorption of the linear Ising magnet, the basic Hamiltonian of which is of the two-particle kind and is treated without approximations. The frequency dependence of the absorption is determined and found to differ analytically from the well-known Debye curve $\chi''_{\textup{Д}}(\omega)$ but for reasonable values of the physical parameters gives an envelope that agrees qualitatively with $\chi''_{\textup{Д}}(\omega)$.

Received: 05.01.1993

 English version: Theoretical and Mathematical Physics, 1994, 98:1, 100–106

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