Magnetic heat transport in R${}_2$CuO${}_4$ (R = La, Pr, Nd, Sm, Eu, and Gd)

Abstract

We have studied the thermal conductivity $\kappa$ on single crystalline samples of the antiferromagnetic monolayer cuprates R${}_2$CuO${}_4$ with R = La, Pr, Nd, Sm, Eu, and Gd. For a heat current within the CuO${}_2$ planes, i.e. for ${\kappa }_{ab}$ we find high-temperature anomalies around 250 K in all samples. In contrast, the thermal conductivity ${\kappa }_c$ perpendicular to the CuO${}_2$ planes, which we measured for R = La, Pr, and Gd, shows a conventional temperature dependence as expected for a purely phononic thermal conductivity. This qualitative anisotropy of ${\kappa }_i$ and the anomalous temperature dependence of ${\kappa }_{ab}$ give evidence for a significant magnetic contribution ${\kappa }_{mag}$ to the heat transport within the CuO${}_2$ planes. Our results suggest, that a large magnetic contribution to the heat current is a common feature of single-layer cuprates. We find that ${\kappa }_{mag}$ is hardly affected by structural instabilities, whereas already weak charge carrier doping causes a strong suppression of ${\kappa }_{mag}$.

arXiv comment7 pages, 4 figures

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