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Evidence for a large magnetic heat current in insulating cuprates

M. Hofmann·T. Lorenz·K. Berggold·M. Gr"uninger·A. Freimuth·G. S. Uhrig·E. Br"uck
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Abstract

The in-plane thermal conductivity $k$ of the two-dimensional antiferromagnetic monolayer cuprate Sr$_2$CuO$_2$Cl$_2$ is studied. Analysis of the unusual temperature dependence of $k$ reveals that at low temperatures the heat is carried by phonons, whereas at high temperatures magnetic excitations contribute significantly. Comparison with other insulating layered cuprates suggests that a large magnetic contribution to the thermal conductivity is an intrinsic property of these materials.

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M. Hofmann, T. Lorenz, K. Berggold, M. Gr"uninger, A. Freimuth, G. S. Uhrig, E. Br"uck. 2003-01-08. Evidence for a large magnetic heat current in insulating cuprates. https://doi.org/10.1103/physrevb.67.184502

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