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Magnon Heat Transport in doped $\rm La_2CuO_4$

C. Hess·B. Büchner·U. Ammerahl·L. Colonescu·F. Heidrich-Meisner·W. Brenig·A. Revcolevschi
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Abstract

We present results of the thermal conductivity of $\rm La_2CuO_4$ and $\rm La_{1.8}Eu_{0.2}CuO_4$ single-crystals which represent model systems for the two-dimensional spin-1/2 Heisenberg antiferromagnet on a square lattice. We find large anisotropies of the thermal conductivity, which are explained in terms of two-dimensional heat conduction by magnons within the CuO$_2$ planes. Non-magnetic Zn substituted for Cu gradually suppresses this magnon thermal conductivity $κ_{\mathrm{mag}}$. A semiclassical analysis of $κ_{\mathrm{mag}}$ is shown to yield a magnon mean free path which scales linearly with the reciprocal concentration of Zn-ions.

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C. Hess, B. Büchner, U. Ammerahl, L. Colonescu, F. Heidrich-Meisner, W. Brenig, A. Revcolevschi. 2003-05-14. Magnon Heat Transport in doped $\rm La_2CuO_4$. https://doi.org/10.1103/physrevlett.90.197002

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