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Unusual Transport Properties near the Insulator-Metal Transition in Colossal Magnetoresistive Manganites
作者姓名:袁松柳  钟强华  DOYANADNADebnath  陈伟  赵力峰  缪菊红  曹恒  刘胜  夏正才
作者单位:DepartmentofPhysics,HuazhongUniversityofScienceandTechnology,Wuhan430074
摘    要:It is argued that a combination of the Griffiths theory and the double-exchange mechanism predicts the random distribution of ferromagnetic metallic clusters above the Curie temperature TC in colossal magnetoresistive manganites. Along this line, we propose a model for the temperature dependence of resistivity that yields a quantitative agreement with experimental data obtained in a typical manganite La2/3Ca1/3MnO3. Our result indicates that the formation and growth of ferromagnetic metallic clusters are responsible for the observation of unusual transport properties near the insulator-metal transition.

关 键 词:输运性质  绝缘体  金属跃迁  磁致电阻  水锰矿
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