title: Scanning Josephson tunneling microscopy of single-crystal Bi_{2}Sr_{2}CaCu_{2}O_{8+delta} with a conventional superconducting tip.
abstract: We have performed both Josephson and quasiparticle tunneling in vacuum tunnel junctions formed between a conventional superconducting scanning tunneling microscope tip and overdoped Bi_{2}Sr_{2}CaCu_{2}O_{8+delta} single crystals. A Josephson current is observed with a peak centered at a small finite voltage due to the thermal-fluctuation-dominated superconducting phase dynamics. Josephson measurements at different surface locations yield local values for the Josephson I_{C}R_{N} product. Corresponding energy gap measurements were also performed and a surprising inverse correlation was observed between the local I_{C}R_{N} product and the local energy gap.
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: Hikari
authors.initials: H
authors.lastname: Kimura
authors.forename: R P
authors.initials: RP
authors.lastname: Barber
authors.forename: S
authors.initials: S
authors.lastname: Ono
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ando
authors.forename: R C
authors.initials: RC
authors.lastname: Dynes