Abstract
Sm 0.56Sr 0.44MnO 3 CMR-manganite with perovskite structure has been studied using the time-resolved transient thermoelectric effect and heat capacity measurements. It was observed that the Seebeck voltage shows an electron-like behavior in the temperature range 50–300 K except for a narrow interval in the vicinity of the Curie point. The transition into the metallic-like ferromagnetic state is not accompanied by an appreciable anomaly of the heat capacity. It is argued that the electrical conductivity arises by the holes moving in a 2p-band of oxygen as well as by electrons in a 3d-impurity band. Arguments are given in favor of a short-range charge ordering in a wide temperature interval above T C.
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