【摘 要】
：
Structural, magnetic, and transport properties of perovskite La2/3Ca1/3Mn1-xSixO3 (x＝0, 0.025, 0.05) have been studied. The incorporation of Si decreases the ove
【机 构】
：
State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chi
论文部分内容阅读
Structural, magnetic, and transport properties of perovskite La2/3Ca1/3Mn1-xSixO3 (x＝0, 0.025, 0.05) have been studied. The incorporation of Si decreases the overall resistivity, but obviously increases the Curie temperature (Tc), metal-insulator transition temperature (Tp), and the magnetoresistance ratio MR (defined as [R(0)-R(H)]/R(O)) near room temperature. Comparing with La2/3Ca1/3MnO3, the Tc, Tp, and MR of the sample with x=0.05 increase by 30, 45K, and 20%, respectively. Lattice effects may play a more important role than the magnetic dilution in the case of low Si substitution.
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