Magnetic heat transport in R2CuO4 (R=La, Pr, Nd, Sm, Eu, and Gd)
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PhysRevB_73_104430.pdf 433 KB
We have studied the thermal conductivity κ on single crystalline samples of the antiferromagnetic monolayer cuprates R2CuO4 with R=La, Pr, Nd, Sm, Eu, and Gd. For a heat current within the CuO2 planes, i.e., for κab we find high-temperature anomalies around 250K in all samples. In contrast, the thermal conductivity κc perpendicular to the CuO2 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 κi and the anomalous temperature dependence of κab give evidence for a significant magnetic contribution κmag to the heat transport within the CuO2 planes. Our results suggest, that a large magnetic contribution to the heat current is a common feature of single-layer cuprates. We find that κmag is hardly affected by structural instabilities, whereas already weak charge carrier doping causes a strong suppression of κmag .
Physical Review B - Condensed Matter and Materials Physics
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American Physical Society
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Graduate School of Advanced Sciences of Matter