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Heat capacity and magnetocaloric properties of La1 − xKxMnO3 manganites

Research paper by I. K. Kamilov, A. G. Gamzatov, A. B. Batdalov, A. S. Mankevich, I. E. Korsakov

Indexed on: 27 Apr '10Published on: 27 Apr '10Published in: Physics of the Solid State



Abstract

The magnetocaloric effect and the heat capacity of La1 − xKxMnO3 (x = 0.1, 0.15, 0.175) ceramic samples have been studied at temperatures in the range 77–350 K and in magnetic fields of up to 27 kOe. The technique for preparing the samples has been described. The heat capacity anomalies related to the ferromagnetic-paramagnetic magnetic phase transition have been revealed and interpreted. It has been demonstrated that the change in the magnetic entropy ΔS calculated from the data on the heat capacity Cp and direct measurements of the magnetocaloric effect ΔT reaches values that are of practical interest.