Abstract
Abstract The electrical transport properties of (La 0.8 Bi 0.2 ) 0.67 Ca 0.33 MnO 3 was studied at the temperature and magnetic field ranges from 10 to 300 K and 0 to 3 T, respectively. An obvious difference in temperature and magnetic field dependence of resistivity between the (La 0.8 Bi 0.2 ) 0.67 Ca 0.33 MnO 3 and pure La 0.67 Ca 0.33 MnO 3 was observed. Especially, an enhanced magnetoresistance effect was obtained in the (La 0.8 Bi 0.2 ) 0.67 Ca 0.33 MnO 3 , such as, a near 100% magnetoresistance plateau within a temperature ranging from 10 to 180 K was observed in a 3 T field. The unusual large magnetoresistance value is encouraging as regard to the potential application of CMR materials. On the other hand, a significant hysteresis both in temperature and magnetic field dependence resistivity is simultaneously observed in the Bi-doped sample.
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