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Calculation of the thermal conductivity and the specific heat of the lattice for a spin-boson system at low temperatures

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Zeitschrift für Physik B Condensed Matter

Abstract

The thermal conductivity of the lattice is calculated for a spin-boson system using the method of inverse linear response theory. The spin-boson Hamiltonian consists of coupled two-level systems (TLS) represented by pseudospin operators, acoustical phonons and an interaction between both systems. The lattice specific heat is determined in the framework of perturbation theory with respect to spin-boson coupling. For the calculation of both quantities results for spin-correlation functions derived within self-consistent random phase approximation are applied. At low temperatures the influence of spin-boson coupling and of interacting TLS on the temperature dependence of the lattice thermal conductivity and of the lattice specific heat is discussed and compared with corresponding experimental investigations.

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  1. Institut für Theoretische Physik, Technische Universität Dresden, Mommsenstrasse 13, O-8027, Dresden, Federal Republic of Germany

    W. Schiller

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Schiller, W. Calculation of the thermal conductivity and the specific heat of the lattice for a spin-boson system at low temperatures. Z. Physik B - Condensed Matter 88, 215–222 (1992). https://doi.org/10.1007/BF01323575

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  • DOI: https://doi.org/10.1007/BF01323575

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