Magnetoresistance plateau in La2/3Ca1/3Bi xMn1 − xO3 granular system

Guoqing Zhang; Chunxu Pan; Guodong Zhang

doi:10.1007/s11595-009-1061-4

Journal of Wuhan University of Technology Materials Science Edition ›› 2009, Vol. 24 ›› Issue (1) : 61 -64. DOI: 10.1007/s11595-009-1061-4

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Magnetoresistance plateau in La_2/3Ca_1/3Bi_xMn_{1 − x}O₃ granular system

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Abstract

The effect of doping additional Bi on the magnetoresistance (MR) of La_2/3Ca_1/3B_xMn_1−xO₃ was investigated. It is found that traditional colossal magnetoresistance (CMR) peak can only be observed in the x<0.05 samples and the peak value decreases with the increase of x, but the x≥0.05 samples show a magnetoresistance plateau above 200 K because of the presence of additional (La,Ca,Bi)-O layers. Moreover, this MR plateau is enhanced for the segregation of the La, Ca, and Bi elements.

Keywords

perovskite manganite / phase segregation / composite / magnetoresistance plateau

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Guoqing Zhang, Chunxu Pan, Guodong Zhang. Magnetoresistance plateau in La_2/3Ca_1/3Bi_xMn_{1 − x}O₃ granular system. Journal of Wuhan University of Technology Materials Science Edition, 2009, 24(1): 61-64 DOI:10.1007/s11595-009-1061-4

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