| 高温超导体中超导位相涨落:Nernst效应研究 |
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| 引用本文： | 许祝安 朱增伟 沈静琴. 高温超导体中超导位相涨落:Nernst效应研究[J]. 科技导报(北京), 2005, 23(12): 33-36 |
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| 作者姓名： | 许祝安 朱增伟 沈静琴 |
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| 作者单位： | 浙江大学物理系,杭州,310027;浙江大学物理系,杭州,310027;浙江大学物理系,杭州,310027 |
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| 基金项目： | 国家杰出青年科学基金资助课题（10225417） |
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| 摘 要： | 高温超导体赝隙态具有许多反常的现象,与高温超导机理之间有密切联系,一直是研究的焦点.有理论提出在赝隙态存在预超导配对.能斯特（Nernst）效应测量探测到了超导转变温度TC0以上温区一定范围内存在磁通涡旋激发,支持了赝隙态中存在有限的超导序参量振幅和强烈的位相涨落的图象,说明TC0处的相变是由Cooper对之间长程位相关联的消失所驱动的.
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| 关 键 词： | 高温超导体 赝隙 位相涨落 能斯特效应 |
| 文章编号： | 1000-7857（2005）12-0033-04 |
| 收稿时间： | 2005-11-14 |
| 修稿时间： | 2005-11-14 |
Phase Fluctuations in High-TC Superconductors: Nernst Effect Study |
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| XU Zhu-an, ZHU Zeng-wei, SHEN Jing-qin. Phase Fluctuations in High-TC Superconductors: Nernst Effect Study[J]. Science & Technology Review, 2005, 23(12): 33-36 |
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| Authors: | XU Zhu-an ZHU Zeng-wei SHEN Jing-qin |
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| Affiliation: | Department of Physics, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Many anomalous phenomena have been found in the pseudogap state of high-To superconductors, and a close relationship between pseudogap state and superconducting state has been proposed, which makes it a focus of interests. Theoretic models predict that preformed Cooper pairs can exist in the pseudogap state. Nernst effect measurements have detected vortex-like excitations in a certain temperature range above superconducting transition temperature, which strongly support that the pseudogap phase is characterized by finite pairing amplitude with strong phase fluctuations and imply that the phase transition at Tc is driven by the loss of long-range phase coherence. |
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| Keywords: | high-Tc superconductors pseudogap phase fluctuations Nernst effect |
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