Chin. Phys. Lett.  2005, Vol. 22 Issue (1): 207-210    DOI:
Original Articles |
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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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.
Keywords: 75.47.Gk      76.30.-v 75.30.Kz     
Published: 01 January 2005
PACS:  75.47.Gk (Colossal magnetoresistance)  
  76.30.-v 75.30.Kz  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2005/V22/I1/0207
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YUAN Song-Liu
ZHONG Qiang-Hua
DOYANANDA Debnath
CHEN Wei
ZHAO Li-Feng
MIAO JU-Hong
CAO Heng
LIU Sheng
XIA Zheng-Cai
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