Magnetoresistance Behavior of La(2-x)/3Bix/3Cal/3MnO3 (x = 0.4)
TANG Wei-hua1, LIANG Jing-kui1,2, LIANG Chang-lin3, SUN Ji-rong1, RAO Guang-hui1
1Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
3Department of Physics, Beijing Normal University, Beijing 100875
Magnetoresistance Behavior of La(2-x)/3Bix/3Cal/3MnO3 (x = 0.4)
1Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
3Department of Physics, Beijing Normal University, Beijing 100875
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.
1997, Vol. 14 
