Enhancement of Curie Temperature and Magnetoresistance in the Perovskites La2/3Ca1/3Mn1-xSixO3

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2000,（11）
• 页码范围: 832-834
• 页数: 3页
• 语种: 英文

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 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.