The critical current of YBa2Cu3O7-d Low Angle Grain Boundaries

Details The critical current of YBa2Cu3O7-d Low Angle Grain Boundaries The critical current of YBa2Cu3O7-d Low Angle Grain Boundaries

2003-02-21

arxiv.org/abs/cond-mat/0302430v2

Durrell et al, Physical Review Letters, 90 (24): 247006 (2003)

Physics

Condensed Matter

Superconductivity

To be published in PRL, new version with minor changes following referees reports

Scientific paper

10.1103/PhysRevLett.90.247006

Transport critical current measurements have been performed on 5 degree [001]-tilt thin film YBa2Cu3O7-delta single grain boundaries with magnetic field rotated in the plane of the film, phi. The variation of the critical current has been determined as a function of the angle between the magnetic field and the grain boundary plane. In applied fields above 1 T the critical current, j_c, is found to be strongly suppressed only when the magnetic field is within an angle phi_k of the grain boundary. Outside this angular range the behavior of the artificial grain boundary is dominated by the critical current of the grains. We show that the phi dependence of j_c in the suppressed region is well described by a flux cutting model.

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