Evidence for a large magnetic heat current in insulating cuprates
Abstract
The in-plane thermal conductivity k of the two-dimensional antiferromagnetic monolayer cuprate Sr2CuO2Cl2 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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