Band-dependent normal-state coherence in Sr2RuO4: Evidence from Nernst effect and thermopower measurements

X. F. Xu, Z. A. Xu, T. J. Liu, D. Fobes, Z. Q. Mao, J. L. Luo, Y. Liu

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Abstract

We present the first measurement on the Nernst effect in the normal state of the odd-parity, spin-triplet superconductor Sr2RuO4. Below 100 K, the Nernst signal was found to be negative, large, and, as a function of magnetic field, nonlinear. Its magnitude increases with the decreasing temperature until reaching a maximum around T*≈20-25K, below which it starts to decrease linearly as a function of temperature. The large value of the Nernst signal appears to be related to the multiband nature of the normal state and the nonlinearity to band-dependent magnetic fluctuation in Sr2RuO4. We argue that the sharp decrease in the Nernst signal below T* is due to the suppression of quasiparticle scattering and the emergence of band-dependent coherence in the normal state.

Original languageEnglish (US)
Article number057002
JournalPhysical review letters
Volume101
Issue number5
DOIs
StatePublished - Jul 28 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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