Nernst effect of a new iron-based superconductor LaO1-xFxFeAs

被引：38

作者：

Zhu, Z. W. ^{[1
]}

Xu, Z. A. ^{[1
]}

Lin, X. ^{[1
]}

Cao, G. H. ^{[1
]}

Feng, C. M. ^{[2
]}

Chen, G. F. ^{[3
]}

Li, Z. ^{[3
]}

Luo, J. L. ^{[3
]}

Wang, N. L. ^{[3
]}

机构：

[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Test & Anal Ctr, Hangzhou 310027, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

来源：

NEW JOURNAL OF PHYSICS | 2008年 / 10卷

关键词：

D O I：

10.1088/1367-2630/10/6/063021

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first Nernst effect measurement on a new iron-based superconductor LaO1-xFxFeAs (x = 0(1). In the normal state, the Nernst signal is negative and very small. Below T-c, a large positive peak caused by vortex motion is observed. The flux flowing regime is quite large compared to the conventional type-II superconductors. The sharp decrease in the Nernst signal at the depairing magnetic field H-c2 is not obvious even for temperatures close to T-c. Furthermore, a clear deviation of the Nernst signal from normal state background and an anomalous suppression of off-diagonal thermoelectric current in the normal state between T-c and 50K are observed. We argue that this anomaly in the normal state Nernst effect could correlate with the spin-density wave (SDW) fluctuations although the contribution of superconducting fluctuations cannot be excluded.

引用

页数：8

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