| 新型超导体MgB2的热电势和电阻率研究 |
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| 引用本文： | 杨宏顺,余旻,李世燕,李鹏程,柴一晟,章良,陈仙辉,曹烈兆. 新型超导体MgB2的热电势和电阻率研究[J]. 物理学报, 2001, 50(6): 1197-1200 |
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| 作者姓名： | 杨宏顺 余旻 李世燕 李鹏程 柴一晟 章良 陈仙辉 曹烈兆 |
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| 作者单位： | 中国科学技术大学结构分析实验室物理系,合肥230026 |
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| 基金项目： | 国家重点基础研究经费(批准号：19990646)资助的课题. |
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| 摘 要： | 测量了MgB2的热电势和电阻率与温度的依赖关系.在100K—300K区间,热电势呈近似线性温度依赖关系,其斜率为正,表明载流子为空穴型且与能带贡献的图像相一致.与此对应,在此温区电阻率呈T2依赖关系.在100K以下,热电势和电阻率各自转变了其高温区的温度依赖关系.热电势在超导转变温度Tc(零电阻366K)到100K间有一宽峰,具有声子曳引峰的特征,表明电子-声子相互作用很强.估算了一些重要的参数,如带米能EF、能带宽度关键词：新型超导体热电势电阻率
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| 关 键 词： | 新型超导体 热电势 电阻率 |
| 收稿时间： | 2001-03-17 |
| 修稿时间： | 2001-03-17 |
STUDY ON THE THERMOPOWER AND RESISTIVITY OF A NEW SUPERCONDUCTOR MgB2 |
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| YANG HONG-SHUN,YU MIN,LI SHI-YAN,LI PENG-CHENG,CHAI YI SHENG,ZHANG LIANG,CHEN XIAN-HUI and CAO LIE-ZHAO. STUDY ON THE THERMOPOWER AND RESISTIVITY OF A NEW SUPERCONDUCTOR MgB2[J]. Acta Physica Sinica, 2001, 50(6): 1197-1200 |
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| Authors: | YANG HONG-SHUN YU MIN LI SHI-YAN LI PENG-CHENG CHAI YI SHENG ZHANG LIANG CHEN XIAN-HUI CAO LIE-ZHAO |
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| Abstract: | The temperature-dependent thermopower and resistivity of MgB2 were measured.In the range of 100—300K, the thermopower presents positive nearly linear temperature dependence,indicating that the charge carrier is hole and it is consistent with the energy band pattern.In contrast,the resistivity follows T2 relationship in the same temperature range.Below 100K,thermopower and resistivity change their temperature dependence.The thermopower presents a hump between the superconducting transition temperature Tc (zero resistance,36.6K) and 100K.It has the characteristic of the phonon drag,indicating the strong electron-phonon interaction.Some important parameters are estimated according to experimental results,such as Fermi energy EF and energy band width. |
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| Keywords: | New type superconductor thermopower resistivity |
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