title: Flux flow of Abrikosov-Josephson vortices along grain boundaries in high-temperature superconductors.
abstract: Low-angle grain boundaries (GBs) in superconductors exhibit intermediate Abrikosov vortices with Josephson cores, whose length l along GB is smaller than the London penetration depth, but larger than the coherence length. We found an exact solution for a periodic vortex structure moving along GBs in a magnetic field H and calculated the flux flow resistivity R(F)(H), and the nonlinear voltage-current characteristics. The predicted R(F)(H) dependence describes well our experimental data on 7 unirradiated and irradiated YBa(2)Cu(3)O(7) bicrystals, from which the core size l(T), and the intrinsic depairing density J(b)(T) on nanoscales of a few GB dislocations were measured for the first time. The observed J(b)(T) = J(b0)(1-T/T(c))(2) indicates a significant order parameter suppression on GB.
authors.affiliation: Applied Superconductivity Center, University of Wisconsin, Madison, WI, USA.
authors.forename: A
authors.initials: A
authors.lastname: Gurevich
authors.forename: M S
authors.initials: MS
authors.lastname: Rzchowski
authors.forename: G
authors.initials: G
authors.lastname: Daniels
authors.forename: S
authors.initials: S
authors.lastname: Patnaik
authors.forename: B M
authors.initials: BM
authors.lastname: Hinaus
authors.forename: F
authors.initials: F
authors.lastname: Carillo
authors.forename: F
authors.initials: F
authors.lastname: Tafuri
authors.forename: D C
authors.initials: DC
authors.lastname: Larbalestier