title: Field-enhanced diamagnetism in the pseudogap state of the cuprate Bi2Sr2CaCu2O(8+delta) superconductor in an intense magnetic field.
abstract: In hole-doped cuprates, Nernst experiments imply that the superconducting state is destroyed by spontaneous creation of vortices which destroy phase coherence. Using torque magnetometry on Bi2Sr2CaCu2O(8+delta), we uncover a field-enhanced diamagnetic signal M above the transition temperature Tc that increases with applied field to 32 Tesla and scales just like the Nernst signal. The magnetization results above Tc distinguish M from conventional amplitude fluctuations and strongly support the vortex scenario for the loss of phase coherence at Tc.
authors.affiliation: Department of Physics, Princeton University, New Jersey 08544, USA.
authors.forename: Yayu
authors.initials: Y
authors.lastname: Wang
authors.forename: Lu
authors.initials: L
authors.lastname: Li
authors.forename: M J
authors.initials: MJ
authors.lastname: Naughton
authors.forename: G D
authors.initials: GD
authors.lastname: Gu
authors.forename: S
authors.initials: S
authors.lastname: Uchida
authors.forename: N P
authors.initials: NP
authors.lastname: Ong