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Nernst effect of the new iron-based superconductor LaO1−xFxFeAs

By Z W Zhu, Z A Xu, X Lin, G H Cao, C M Feng, Z Li, J L Luo and N L Wang


Abstract. We report the first Nernst effect measurement on the new iron-based superconductor LaO1−xFxFeAs (x = 0.1). In the normal state, the Nernst signal is negative and very small. Below Tc a large positive peak caused by vortex motion is observed. The flux flowing regime is quite large compared to conventional type-II superconductors. The sharp decrease in Nernst signal at the depairing magnetic field Hc2 is not obvious even for temperatures close to Tc. Furthermore, a clear deviation of the Nernst signal from normal state background and an anomalous suppression of offdiagonal thermoelectric current in the normal state between Tc and 50 K are observed. We argue that this anomaly in the normal state Nernst effect could correlate with the SDW fluctuations although the contribution of superconducting fluctuations can not be excluded

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