## Flux Penetration in Superconducting Strip with Edge-Indentation    [PDF]

J. I. Vestgarden, D. V. Shantsev, Y. M. Galperin, T. H. Johansen
The flux penetration near a semicircular indentation at the edge of a thin superconducting strip placed in a transverse magnetic field is investigated. The flux front distortion due to the indentation is calculated numerically by solving the Maxwell equations with a highly nonlinear \$E(j)\$ law. We find that the excess penetration, \$\Delta\$, can be significantly (\$\sim\$ 50%) larger than the indentation radius \$r_0\$, in contrast to a bulk supercondutor in the critical state where \$\Delta=r_0\$. It is also shown that the flux creep tends to smoothen the flux front, i.e. reduce \$\Delta\$. The results are in very good agreement with magneto-optical studies of flux penetration into an YBa\$_2\$Cu\$_3\$O\$_x\$ film having an edge defect.
View original: http://arxiv.org/abs/0706.0631