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Magnetic heat transport in R_2CuO_4 with R = La, Pr, Nd, Sm, Eu, and Gd | | K. Berggold
; T. Lorenz
; J. Baier
; M. Kriener
; D. Senff
; H. Roth
; A. Severing
; H. Hartmann
; A. Freimuth
; S. Barilo
; F. Nakamura
; | | Date: |
15 Sep 2005 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We have studied the thermal conductivity k on single crystalline samples of the antiferromagnetic monolayer cuprates R_2CuO_4 with R=La, Pr, Nd, Sm, Eu, and Gd. For a heat current within the CuO_2 planes, i.e. for k_{ab} we find high-temperature anomalies around 250 K in all samples. In contrast, the thermal conductivity k_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 k_i and the anomalous temperature dependence of k_{ab} give evidence for a significant magnetic contribution k_{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. In addition, we find that already weak charge carrier doping causes a strong suppression of k_{mag}. | | Source: | arXiv, cond-mat/0509414 | | Services: | Forum | Review | PDF | Favorites | |
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