La0.67-xNdxSr0.33MnO3体系的磁性和电性

无机材料学报, 2008, 23(2): 271-276. doi: 10.3724/SP.J.1077.2008.00271

La_0.67-xNd_xSr_0.33MnO₃体系的磁性和电性

刘宁 , 郭焕银 , 彭振生 , 蔡之让 , 曲哲

1.1. 宿州学院自旋电子与纳米材料安徽省重点实验室培育基地, 宿州 234000

2. 2. 中国科学技术大学结构分析开放实验室, 合肥 230026

1.1. Ankui Key Laboratory of Spin Electron and Nanomaterials (Cultivating Base), Suzhou College, Suzhou 234000, China

2. 2. Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China

关键词：磁结构 , transport behavior , lattice effect , interface tunneling effect

Magneto-electric Behaviors of La_0.67-xNd_xSr_0.33MnO₃ System

LIU Ning , GUO Huan-Yin , PENG Zhen-Sheng , CAI Zhi-Rang , QU Zhe

Keywords： magnetic structure , 输运行为 , 次晶格 , 界面隧穿效应

通过M-T曲线、ESR曲线、红外光谱、拉曼光谱、ρ-T曲线和MR-T曲线的测量, 研究了La_0.67-xNd_xSr_0.33MnO₃ (x=0.10, 0.20, 0.30, 0.40, 0.50)样品的磁电性质. 实验结果表明: 随着Nd掺杂的增加, 样品的磁结构从长程铁磁有序向自旋团簇玻璃态、反铁磁态转变; 当x=0.30、0.40时发生相分离, 且x=0.40样品的ZFC曲线随温度升高在160K左右突然跌落, 出现少见的“肩膀”; 样品的电行为随着Nd掺杂的增加发生变化. 样品的磁电行为和CMR效应来源于Nd掺杂引起的次晶格不同耦合和与自旋相关的界面隧穿效应.

The magneto-electric behaviors of La_0.67-xNd_xSr_0.33MnO₃ system were studied by the measurement of M-T curve, ESR curve, infrared spectra, Raman spectra, ρ-T curve and MR-T curve of the La_0.67-xNd_xSr_0.33MnO₃ system (x=0.00, 0.10, 0.20, 0.30, 0.40). The experiment result shows that with the Nd doping increasing, the magnetic structure of the system transforms from the long-range ferromagnetic order to spin cluster glass state; for the samples with x=0.30 and 0.40, the phase separation occurs at the temperature high above T_c; The transport property exhibits change with the Nd doping increasing. Magneto-electric behaviors of the system and CMR effect attributes to lattice effect and interface tunneling effect relating to the spin.

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