Transport effects in single-crystal La0.82Ca0.18MnO3 |
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Authors: | N G Bebenin R I Zaĭnullina N S Bannikova V V Ustinov Ya M Mukovskiĭ |
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Institution: | (1) Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoĭ 18, Yekaterinburg, 620219, Russia;(2) Moscow State Institute of Steel and Alloys, Leninskiĭ pr. 4, Moscow, 119049, Russia |
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Abstract: | This paper reports experimental data on the temperature dependences of the electrical resistivity, magnetoresistance, thermopower, magnetothermopower, and normal and spontaneous Hall coefficients of the La0.82Ca0.18MnO3 single crystal with a Curie temperature of 180 K. It is shown that, at low temperatures, electrons are the majority carriers. For T < 110 K, the electrical resistivity depends substantially on the position of the magnetization vector with respect to the crystallographic axes, which implies a significant role played by the spin-orbit interaction. For T > 137 K, holes are dominant. In the vicinity of the Curie temperature, electrical conduction is effected primarily by holes activated to the mobility edge. The local activation energy of the resistivity exhibits a critical behavior. The temperature dependence of the local activation energy is determined by spin correlation functions. For T > 240 K, the activation energy does not depend on temperature. |
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