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

Research output: Contribution to journalArticle

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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

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parity
nonlinearity
retarding
temperature
scattering
magnetic fields

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Band-dependent normal-state coherence in Sr2RuO4: Evidence from Nernst effect and thermopower measurements",
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.",
author = "Xu, {X. F.} and Xu, {Z. A.} and Liu, {T. J.} and D. Fobes and Mao, {Z. Q.} and Luo, {J. L.} and Y. Liu",
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Band-dependent normal-state coherence in Sr2RuO4 : Evidence from Nernst effect and thermopower measurements. / Xu, X. F.; Xu, Z. A.; Liu, T. J.; Fobes, D.; Mao, Z. Q.; Luo, J. L.; Liu, Y.

In: Physical Review Letters, Vol. 101, No. 5, 057002, 28.07.2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Band-dependent normal-state coherence in Sr2RuO4

T2 - Evidence from Nernst effect and thermopower measurements

AU - Xu, X. F.

AU - Xu, Z. A.

AU - Liu, T. J.

AU - Fobes, D.

AU - Mao, Z. Q.

AU - Luo, J. L.

AU - Liu, Y.

PY - 2008/7/28

Y1 - 2008/7/28

N2 - 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.

AB - 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.

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