JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2004 Vol.5 No.5 P.603-608

http://doi.org/10.1631/jzus.2004.0603

Study of transport behavior for Fe-doping La_0.67Ca_0.33MnO₃ perovskite manganese

Author(s): CUI Yu-jian, GE Hong-liang, HAN Yan-bing, JIA Guang-qiang, WANG Xin-yan, CAO Yi-gang, ZHANG Jin-cang
Affiliation(s): Department of Physics, China Institute of Metrology, Hangzhou 310018, China; more
Corresponding email(s): yjcui@cim.edu.cn
Key Words: La_2/3Ca_1/3MnO₃, Fe-doping, Crystal structure, Transport properties

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Abstract: Systematic studies of the transport properties of La_0.67Ca_0.33Mn_1-xFe_xO₃ (x=0-0.3) systems showed that with increasing fe-doping content x the resistance increases and the insulator-metal transition temperature moves to lower temperature. For small doping content, the transport property satisfies metal transport behavior below the transition temperature, and above the transition temperature it satisfies the small polaron model. This behavior can be explained by Fe³⁺ doping, which easily forms Fe³⁺-O^2--Mn⁴⁺ channel, suppressing the double exchange Mn³⁺-O^2--Mn⁴⁺ channel and enhancing the spin scattering of Mn ions induced by antiferromagnetic clusters of Fe ions.

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