Thermal conductivity of R2CuO4, with R = La, Pr and Gd
K. Berggold, T. Lorenz, J. Baier, M. Kriener, D. Senff, S. Barilo, A. Freimuth
Abstract
We present measurements of the in-plane kappaab and out-of-plane kappac thermal conductivity of Pr2CuO4 and Gd2CuO4 single crystals. The anisotropy gives strong evidence for a large contribution of magnetic excitations to kappaab i.e. for a heat current within the CuO2 planes. However, the absolute values of kappamag are lower than previous results on La2CuO4. These differences probably arise from deviations from the nominal oxygen stoichiometry. This has a drastic influence on kappamag, which is shown by an investigation of a La2CuO4+delta polycrystal.
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