title: Experimental evidence for the vortex glass phase in untwinned, proton irradiated YBa2Cu3O7-delta.
abstract: We report on magnetoresistance measurements of the effects of 9 MeV proton irradiation on a clean, untwinned single crystal of YBa2Cu3O7-delta. For the first time, evidence for a vortex glass transition is detected in an untwinned single crystal of YBa2Cu3O7-delta with induced pointlike disorder, in which the first order vortex melting transition is completely suppressed after proton irradiation. Our results suggest that a sufficiently high pinning disorder is required in order for the vortex glass phase to be observed.
authors.affiliation: Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 and and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: A M
authors.initials: AM
authors.lastname: Petrean
authors.forename: L M
authors.initials: LM
authors.lastname: Paulius
authors.forename: W K
authors.initials: WK
authors.lastname: Kwok
authors.forename: J A
authors.initials: JA
authors.lastname: Fendrich
authors.forename: G W
authors.initials: GW
authors.lastname: Crabtree