Unusual Transport Properties near the Insulator--Metal Transition in Colossal Magnetoresistive Manganites

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 T_C 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 La_2/3Ca_1/3MnO₃. 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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