Thermal conductivity of a quantum spin-1/2 antiferromagnetic chain with magnetic impurities

Автор(и)

  • A.A. Zvyagin B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine

DOI:

https://doi.org/10.1063/1.2889411

Ключові слова:

thermal conductivity, spin chain, magnetic impurities.

Анотація

We present an exact theory that describes how magnetic impurities change the behavior of the thermal conductivity for the integrable Heisenberg antiferromagnetic quantum spin-1/2 chain. Single magnetic impurities and a large concentration of impurities with similar values of the couplings to the host chain (a weak disorder) do not change the linear-in-temperature low-T behavior of the thermal conductivity: Only the slope of that behavior becomes smaller, comparing to the homogeneous case. The strong disorder in the distribution of the impurity-host couplings produces more rapid temperature growth of the thermal conductivity, compared to the linear in T dependence of the homogeneous chain and the chain with a weak disorder. Recent experiments on the thermal conductivity in inhomogeneous quasi-one-dimensional quantum spin systems manifest qualitative agreement with our results.

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Опубліковано

2008-02-26

Як цитувати

(1)
Zvyagin, A. Thermal Conductivity of a Quantum Spin-1/2 Antiferromagnetic Chain With Magnetic Impurities. Fiz. Nizk. Temp. 2008, 34, 273-277.

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Розділ

Низькоpозмірні та невпорядковані системи

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