Magnetic heat transport in R2CuO4 (R=La, Pr, Nd, Sm, Eu, and Gd)

被引:22
|
作者
Berggold, K
Lorenz, T
Baier, J
Kriener, M
Senff, D
Roth, H
Severing, A
Hartmann, H
Freimuth, A
Barilo, S
Nakamura, F
机构
[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
[2] Belarussian Acad Sci, Inst Solid State & Semicond Phys, Minsk 220072, BELARUS
[3] Hiroshima Univ, Dept Quantum Matter, ADSM, Higashihiroshima 7398526, Japan
关键词
D O I
10.1103/PhysRevB.73.104430
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the thermal conductivity kappa 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 kappa(ab) we find high-temperature anomalies around 250 K in all samples. In contrast, the thermal conductivity kappa(c) 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 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 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 kappa(mag) is hardly affected by structural instabilities, whereas already weak charge carrier doping causes a strong suppression of kappa(mag).
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页数:7
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