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* approximately equal to 20-25 K, 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.
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou, China.
authors.forename: X F
authors.initials: XF
authors.lastname: Xu
authors.forename: Z A
authors.initials: ZA
authors.lastname: Xu
authors.forename: T J
authors.initials: TJ
authors.lastname: Liu
authors.forename: D
authors.initials: D
authors.lastname: Fobes
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Mao
authors.forename: J L
authors.initials: JL
authors.lastname: Luo
authors.forename: Y
authors.initials: Y
authors.lastname: Liu