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A phenomenological expression of the metal-insulator transition temperature is proposed for AMnO3 manganese perovskites by taking into account the distortion of the Mn-O-Mn bond due to A-cation size and the straindependent effect due to performed Jahn-Teller distortions, independently. Using reasonable physical parameters,the calculated results give excellent agreement with experimental data obtained in polycrystalline samples of La2/3 (Ca1-xBax)1/3MnO3, providing a strong support to this approach.