Exchange interaction and magnetoresistance in La2/3Ca1/3MnO3: experiment and models
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The magnetization M(T) and electrical resistivity (T) of a La 2/3Ca1/3MnO3 film have been studied in the temperature range 5KT320K in the magnetic field intervals 10OeH400Oe and 0H50kOe, respectively. It is found that the M(T)/M(0) value is larger than that predicted by the conventional molecular field model below the Curie point T=267K, and that the ln(T) dependence is close to linear in the temperature range 80K