The Hall-Lorenz number in the La1.855Sr0.145CuO4 single crystal |
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Authors: | Marcin Matusiak Jun’ya Hori |
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Institution: | a Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroc?aw, Poland b Department of Applied Physics, Okayama University of Science, Ridai-cho, Okayama 700-0005, Japan c Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan |
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Abstract: | The temperature dependence of the Hall-Lorenz number () for the optimally doped La1.855Sr0.145CuO4 (LSCO) has been obtained from the experimentally determined transverse and longitudinal transport coefficients. A comparison between Lxy(T) dependence found for LSCO and Lxy(T) reported previously for copper indicates that the Hall-Lorenz number in LSCO follows standard metallic behavior from room temperature down to . Below this temperature the Lxy coefficient deviates from regular metallic dependence in a way characteristic of an electronic system with lowered density of electronic states at the Fermi level. We present results of calculations provided in terms of the Boltzmann equation for a two-dimensional model of the electronic structure with a d-symmetrical pseudogap. A temperature Tmax, where a maximum in the Lxy(T) dependence appears, turns out to be dependent on the width of the supposed pseudogap . The best agreement between the model and the experimental data was obtained for , which corresponds well with values reported previously by other groups. |
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Keywords: | 74 25 Fy 74 72 Dn |
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