| 掺锰钙钛矿系统在外磁场下的相变与热力学性质 |
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| 引用本文： | 屈少华,姚凯伦,刘祖黎. 掺锰钙钛矿系统在外磁场下的相变与热力学性质[J]. 低温物理学报, 2008, 30(4) |
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| 作者姓名： | 屈少华 姚凯伦 刘祖黎 |
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| 作者单位： | 1. 华中科技大学物理系;襄樊学院物理与电子技术信息系
2. 华中科技大学物理系 |
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| 基金项目： | 国家自然科学基金，湖北省教育厅科技计划项目 |
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| 摘 要： | 本文用渗流模型研究T(La1-xBx)2/3Ca1/2MnO3系统由顺磁性向铁磁性转换过程中外磁场与转换温度的关系.在平均场理论中,电阻是外磁场和温度的函数.我们发现:当外加磁场不太强时,转化温度随着外磁场的增加而线性地增加.并计算了该系统的热容量.我们理论上的计算与最近的实验观察相当符合.
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| 关 键 词： | 渗流 钙钛矿 磁场 温度 |
THERMODYNAMIC PROPERTIES AND PHASE TRANSITION FOR DOPED MANGANESE PEROVSKITES EXOTIC MAGNETIC FIELD |
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| QU Shao-hua,YAO Kai-lun,LIU Zu-li. THERMODYNAMIC PROPERTIES AND PHASE TRANSITION FOR DOPED MANGANESE PEROVSKITES EXOTIC MAGNETIC FIELD[J]. Chinese Journal of Low Temperature Physics, 2008, 30(4) |
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| Authors: | QU Shao-hua YAO Kai-lun LIU Zu-li |
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| Abstract: | On basis of a magnetic percolation model, magnetic transition has been studied for (La1-xBx)Ca1/3 MnO3 system, consisting of paramagnetie and ferromagnetic domains. In the mean-field approach,magnetic resistance as a function of temperature and magnetic field is derived analytically. Subsequently,the thermal capacitance and magnetic resistance are calculated numerically, and compared with recent measurements. It is found there is linear dependence of the critical temperature on the magnetic field,provided the magnetic field is not too strong. The theoretical predications agree well with experiments. |
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| Keywords: | percolation perovskite magnetic field temperature |
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