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Transport critical current measurements have been performed on 5 degree[001]-tilt thin film YBa2Cu3O7-delta single grain boundaries with magneticfield rotated in the plane of the film, phi. The variation of the criticalcurrent has been determined as a function of the angle between the magneticfield and the grain boundary plane. In applied fields above 1 T the criticalcurrent, j_c, is found to be strongly suppressed only when the magnetic fieldis within an angle phi_k of the grain boundary. Outside this angular range thebehavior of the artificial grain boundary is dominated by the critical currentof the grains. We show that the phi dependence of j_c in the suppressed regionis well described by a flux cutting model.Comment: To be published in PRL, new version with minor changes following  referees report

physical review letters

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Critical Current ofYBa2Cu3O7−