Magnetoresistance Behavior of La(2-x)/3Bix/3Cal/3MnO3 (x = 0.4)
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Abstract
The magnetoresistance (MR) behavior of La(2-x)/3Bix/3Cal/3MnO3 (x = 0.4) compound was investigated. The compound exhibits complex magnetic transitions, i. e., paramagnetic-canted ferromagnetic-ferromagnetic-spin glass transitions. The temperature dependence of resistivity of the compound indicates a semiconducting behavior, and no semiconductor-metal transition was associated with these magnetic transitions. The magnetoresistance ratio exhibits a critical maximum corresponding to the canted ferromagnetic transition. A MR ratio as large as 86% was observed at 85 K. The temperature dependence of MR ratio is well described by the relation of ( ρo -ρH ) / ρo = A(M/Ms)2.
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