| La2/3Ca1/3MnO3样品的磁和电子输运性质研究 |
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| 引用本文： | 李建青,袁松柳.La2/3Ca1/3MnO3样品的磁和电子输运性质研究[J].武汉大学学报(理学版),2005,51(1):55-58. |
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| 作者姓名： | 李建青 袁松柳 |
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| 作者单位： | 1. 武汉理工大学,理学院,湖北,武汉,430070
2. 华中科技大学,物理学系,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金资助项目(10374032) |
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| 摘 要： | 实验研究了La2/3CamMnO3样品零磁场下的电阻率和低磁场下的磁化强度随温度的变化行为．结果表明，除了居里温度(Tc)外还存在另一特征温度Tonset，高于Tonset的样品为典型的顺磁绝缘体，而低于Tc的样品为典型的铁磁金属，但在Lonset和Tc之间，样品的磁化率大大偏离居里一外斯定律，同时其导电特性显示出明显的反常．对观察到的不寻常导电特性，根据铁磁金属集团在顺磁绝缘体背景上随机分布的假设，进行了分析与探讨。
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| 关 键 词： | Mn基钙钛矿 庞磁电阻效应 绝缘体-金属转变 铁磁金属集团 |
| 文章编号： | 1671-8836(2005)01-0055-04 |
| 修稿时间： | 2004年8月27日 |
Magnetic and Electronic Transport Properties in La2/3Ca1/3MnO3 |
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| LI Jian-qing,YUAN Song-liu.Magnetic and Electronic Transport Properties in La2/3Ca1/3MnO3[J].JOurnal of Wuhan University:Natural Science Edition,2005,51(1):55-58. |
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| Authors: | LI Jian-qing YUAN Song-liu |
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| Institution: | LI Jian-qing~1,YUAN Song-liu~2 |
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| Abstract: | Temperature dependences of zero-field resistivity and low-field magnetization are measured for La_(2/3)Ca_(1/3)MnO_3. The results indicate that besides the Curie temperature T_C, there exists an additional characteristic temperature T_(onset). The sample shows typical paramagnetic insulating behavior above T_(onset) and ferromagnetic metallic behavior below T_C. But for the temperature range between T_(onset) and T_C, the large deviation of susceptibility from the Curie-Weiss law and the anomalous conductivity behavior are observed simultaneously. Based on the random distribution of ferromagnetic metallic clusters in the paramagnetic insulating background, the anomalous conductivity behavior observed for T_C
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| Keywords: | Mn based perovskites colossal magnetoresistance insulator-metal transition ferromagnetic metallic clusters |
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