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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

A位的Gd掺杂对La0.7-xGdxSr0.3MnO3体系磁结构的影响

郭焕银1; 彭振生1; 蔡之让1; 刘宁1,2   

  1. 1. 宿州学院物理系, 宿州 234000; 2. 中国科学技术大学结构分析重点实验室, 合肥 230026
  • 收稿日期:2004-05-26 修回日期:2004-08-03 出版日期:2005-05-20 网络出版日期:2005-05-20

Influence of Gd Doping at A Site upon the Magnetic Structure of La0.7-xGdxSr0.3MnO3 System

GUO Huan-Yin1; PENG Zhen-Sheng1; CAI Zhi-Rang1; LIU Ning1,2   

  1. 1. Department of Physics; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Suzhou+College','knet','status=yes,scrollbars=yes,width=375,height=250')">Suzhou College; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Suzhou+234000','knet','status=yes,scrollbars=yes,width=375,height=250')">Suzhou 234000; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=China','knet','status=yes,scrollbars=yes,width=375,height=250')">China; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Structure+Research+Laboratory','knet','status=yes,scrollbars=yes,width=375,height=250')">Structure Research Laboratory; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=University+of+Science+and+Technology+of+China','knet','status=yes,scrollbars=yes,width=375,height=250')">University of Science and Technology of China; 2. onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Hefei+230026','knet','status=yes,scrollbars=yes,width=375,height=250')">Hefei 230026; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=China%ef%bc%89','knet','status=yes,scrollbars=yes,width=375,height=250')">China
  • Received:2004-05-26 Revised:2004-08-03 Published:2005-05-20 Online:2005-05-20

PDF (PC)

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摘要： 研究了La0.7-xGdxSr0.3MnO3(x=0.00、0.10、0.15、0.20、0.30、0.40、0.50、0.60、0.70)体系的M-T曲线、M-H曲线和电子自旋共振谱(ESR).实验结果表明:在Gd掺杂浓度比较低时,体系表现为长程铁磁有序;当x=0.30、0.40时,体系表现为自旋团簇玻璃态;当x≥0.50以后,体系表现为反铁磁特征.对x=0.30、0.40样品,ESR谱表明在远高于Tc温度存在相分离现象.

关键词: 庞磁电阻, 磁结构, 相分离

Abstract: M-T curves, M-H curves, and electron-spin-resonance spectra (ESR) of La0.7-xGdx-Sr0.3MnO3(0.0≤x≤0.70) were investigated. The experimental results indicate that the system is in a ferromagnetic long-range order at Gd low-doping level; at x=0.30 and 0.40, the samples show cluster-spin glass behavior; at x≥0.50, the system possesses the antiferromagnetic characters. For the samples x=0.30 and 0.40, ESR spectra demonstrate that the phase separation occurs at the temperature far above Tc.

Key words: colossal magnetoresistance effect, magnetic structure, phase separation

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