title: High field phase diagram of cuprates derived from the Nernst effect.
abstract: Measurements of the Nernst signal in the vortex-liquid state of the cuprates to high fields (33 T) reveal that vorticity extends to very high fields even close to the zero-field critical temperature T(c0). In overdoped La2-xSrxCuO4, we show that the upper critical field H(c2)(T) curve does not end at T(c0), but at a much higher temperature. These results imply that T(c0) corresponds to a loss in phase rigidity rather than a vanishing of the pairing amplitude. An intermediate field H*(T)<<H(c2)(T) is shown to be the field scale for the flux-flow resistivity.
authors.affiliation: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Yayu
authors.initials: Y
authors.lastname: Wang
authors.forename: N P
authors.initials: NP
authors.lastname: Ong
authors.forename: Z A
authors.initials: ZA
authors.lastname: Xu
authors.forename: T
authors.initials: T
authors.lastname: Kakeshita
authors.forename: S
authors.initials: S
authors.lastname: Uchida
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.forename: R
authors.initials: R
authors.lastname: Liang
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy