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Unusual Transport Properties near the Insulator--Metal Transition in Colossal Magnetoresistive Manganites |
YUAN Song-Liu;ZHONG Qiang-Hua;DOYANANDA Debnath;CHEN Wei;ZHAO Li-Feng;MIAO JU-Hong ;CAO Heng; LIU Sheng;XIA Zheng-Cai |
Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 |
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Cite this article: |
YUAN Song-Liu, ZHONG Qiang-Hua, DOYANANDA Debnath et al 2005 Chin. Phys. Lett. 22 207-210 |
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Abstract 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.
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Keywords:
75.47.Gk
76.30.-v 75.30.Kz
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Published: 01 January 2005
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