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arXiv · 0706.0631

Flux Penetration in Superconducting Strip with Edge-Indentation

J. I. Vestgarden·D. V. Shantsev·Y. M. Galperin·T. H. Johansen
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Abstract

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, $Δ$, can be significantly ($\sim$ 50%) larger than the indentation radius $r_0$, in contrast to a bulk supercondutor in the critical state where $Δ=r_0$. It is also shown that the flux creep tends to smoothen the flux front, i.e. reduce $Δ$. 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.

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J. I. Vestgarden, D. V. Shantsev, Y. M. Galperin, T. H. Johansen. 2013-05-06. Flux Penetration in Superconducting Strip with Edge-Indentation. https://doi.org/10.1103/physrevb.76.174509

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