Nernst effect of the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAs

Details Nernst effect of the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAs Nernst effect of the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAs

2008-04-08

arxiv.org/abs/0804.1324v2

New J. Phys. 10 (2008) 063021

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures; Latex file changed, references added

Scientific paper

10.1088/1367-2630/10/6/063021

We report the first Nernst effect measurement on the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAs $(x=0.1)$. 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 conventional type-II superconductors. However, a clear deviation of the Nernst signal from normal state background and an anomalous depression of off-diagonal thermoelectric current in the normal state between $T_{c}$ and 50 K are observed. We propose that this anomaly in the normal state Nernst effect could correlate with the SDW fluctuations.

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