We report numerical simulations of magnetic flux patterns in asymmetric (formula presented) -tilt grain boundaries in (formula presented) superconducting films. The grain boundaries are treated as Josephson junctions with a critical current density (formula presented) alternating rapidly along the junctions with a typical length scale which is much less than Josephson penetration depth. We demonstrate the existence of Josephson vortices with fractional flux quanta for both periodic and random (formula presented) A method is proposed to extract these “fractional” vortices from experimental flux patterns.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 2001