Explanation of low critical currents in flat, bulk vs. meandering, thin-film [001] tilt bicrystal grain boundaries in YBa{sub 2}Cu{sub 3}O{sub 7}.

Thin-film and bulk [001] tilt, bicrystal grain boundaries in YBa{sub 2}Cu{sub 3}O{sub 7} exhibit a strong dependence of critical current density on misorientation angle. What is particularly difficult to understand is its thirty times lower magnitude in bulk grain boundaries which are microscopically more perfect, i.e., flatter, minimally faceted, and free of impurity phases. A plausible explanation, based on differences of the pinning of Josephson vortices in these grain boundary types, is proposed here.