Fractional Josephson vortices at YBa$_2$Cu$_3$O$_{7-x}$ grain boundaries

Details Fractional Josephson vortices at YBa$_2$Cu$_3$O$_{7-x}$ grain boundaries Fractional Josephson vortices at YBa$_2$Cu$_3$O$_{7-x}$ grain boundaries

2001-01-08

arxiv.org/abs/cond-mat/0101085v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, ReVTeX, submitted to PRL

Scientific paper

We report numerical simulations of magnetic flux patterns in asymmetric 45$^{\circ}$ [001]-tilt grain boundaries in YBa$_2$Cu$_3$O$_{7-x}$ superconducting films. The grain boundaries are treated as Josephson junctions with the critical current density $j_c(x)$ alternating along the junctions. We demonstrate the existence of Josephson vortices with fractional flux quanta for both periodic and random $j_c(x)$. A method is proposed to extract fractional vortices from experimental flux patterns.

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