| 钙钛矿型稀土锰氧化物La2/3Ca1/3MnO3中Mn位的Ti替代效应 |
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| 引用本文： | 李润伟,王志宏,陈 新,沈保根.钙钛矿型稀土锰氧化物La2/3Ca1/3MnO3中Mn位的Ti替代效应[J].物理学报,1999,48(13):105-110. |
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| 作者姓名： | 李润伟 王志宏 陈 新 沈保根 |
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| 作者单位： | (1)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080; (2)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080；中国科学技术大学物理系，合肥 230026 |
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| 基金项目： | 国家自然科学基金（批准号：59702011和59525101）和国家重点基础研究发展规划（批准号：G1998061300）资助的课题. |
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| 摘 要： | 研究了钙钛矿型锰氧化物La2/3Ca1/3Mn1-xTixO3(0≤x≤0.3)的结构、磁性和输运性质.发现Ti替代Mn强烈地抑制了La2/3Ca1/3MnO3的铁磁性和金属电导，并很大地提高了磁电阻值.在低掺杂情况下(x≤0.04),1%的Mn被Ti替代，居里温度TC和金属-绝缘体转变温度Tp分别平均下降了31和26.5K.当x=0.06时，铁磁态过渡为团簇玻璃态，并在x=0.20时完全变为自旋玻璃态.指出由于Ti的掺入而引起的磁稀释作用以及局域晶格畸变是产生上述结果的主要原因.
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| 收稿时间： | 1999-06-10 |
Doping Effects Arising From the Substitution of Ti for Mn in the Perovskite Compounds La2/3Ca1/3MnO3 |
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| Li Run-Wei,Wang Zhi-Hong,Chen Xin and Shen Bao-Gen.Doping Effects Arising From the Substitution of Ti for Mn in the Perovskite Compounds La2/3Ca1/3MnO3[J].Acta Physica Sinica,1999,48(13):105-110. |
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| Authors: | Li Run-Wei Wang Zhi-Hong Chen Xin and Shen Bao-Gen |
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| Abstract: | The magnetic and transport properties of compounds La2/3Ca1/3Mn1-xTixO3(0≤x≤0.3) have been investigated. The substitution of Ti for Mn suppresses the ferromagnetism and metal conduction and increases magnetoresistance dramatically. In the case of low doping (x≤0.04), substituting Ti for 1% Mn lowers Curie temperature TC and metal-insulator transition temperature Tp by about 31 and 26.5K respectively. The magnetic spontaneous state becomes cluster glass state for the compound with x=0.06, and turns into spin-glass state for the compound with x=0.20. The magnetic dilution and the local lattice distortion due to the introduction of Ti are suggested to explain the experimental results. |
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