| Gd替代对La0.6-xGdxSr1.4MnO4磁性和输运性质的影响 |
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| 引用本文： | 马骁,鲁毅,寇志起,邸乃力,成昭华,李庆安.Gd替代对La0.6-xGdxSr1.4MnO4磁性和输运性质的影响[J].中国物理 B,2005,14(1):192-195. |
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| 作者姓名： | 马骁 鲁毅 寇志起 邸乃力 成昭华 李庆安 |
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| 作者单位： | State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| 基金项目： | Project supported by the Hundred Talents Programme of Chinese Academy of Sciences, the National Natural Sciences Foundation of China (Grant Nos 50272082 and 10274014) and the State Key Project of Fundamental Research, China (Grant No 2001CB610605) |
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| 摘 要： | 随着x的增加，多晶La0.6-xGdxSr1.4MnO4（x=0, 0.1, 0.2, 0.4, 0.6）的零场冷却 曲线从类自旋玻璃型转变成顺磁型，并且每条零场冷却 曲线都有一在20K的拐点。这一行为可以从Gd和Mn各自对材料总磁性的不同贡献来理解。另外，在所有的样品中，从100K到室温，都观察到了热激活导电行为。由于Mn-Mn间强的反铁磁耦和，直到外场达到50 kOe，都没有观察到明显的磁电阻效应。
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| 关 键 词： | 自旋玻璃，磁性，反铁磁，磁电阻 |
| 收稿时间： | 2004-03-19 |
| 修稿时间： | 9/1/2004 12:00:00 AM |
Effects of Gd substitution on magnetic and transport properties in La0.6-xGdxSr1.4MnO4 |
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| Ma Xiao,Lu Yi,Kou Zhi-Qi,Di Nai-Li,Cheng Zhao-Hua and Li Qing-An.Effects of Gd substitution on magnetic and transport properties in La0.6-xGdxSr1.4MnO4[J].Chinese Physics B,2005,14(1):192-195. |
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| Authors: | Ma Xiao Lu Yi Kou Zhi-Qi Di Nai-Li Cheng Zhao-Hua and Li Qing-An |
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| Affiliation: | State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | With the increasing of x, the ZFC (zero-field cooling) M-T curves for the
polycrystals La0.6-xGdxSr1.4MnO4(x=0, 0.1, 0.2, 0.4,0.6) change from spin-glass-like to paramagnetic, and each ZFC M-T curve has an inflection point at 20K. These behaviours can be understood by considering the respective contributions of Mn and Gd to the total magnetism. In addition, for all the samples, thermal activation conducting behaviours are observed from 100 K to room temperature. Due to the strong antiferromagnetic coupling between neighbouring Mn ions, there is no obvious magnetoresistance effect until the magnetic field strength rises to 3.98$\tm10^6$A/m. |
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| Keywords: | spin glass magnetism antiferromagnetic magnetoresistance |
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