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


  • 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


Ключові слова:

thermal conductivity, spin chain, magnetic impurities.


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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Як цитувати

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



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