Flux Penetration in Superconducting Strip with Edge-Indentation

Details Flux Penetration in Superconducting Strip with Edge-Indentation Flux Penetration in Superconducting Strip with Edge-Indentation

2007-06-05

arxiv.org/abs/0706.0631v1

Phys. Rev. B 76, 174509 (2007)

Physics

Condensed Matter

Superconductivity

5 pages, 7 figures

Scientific paper

10.1103/PhysRevB.76.174509

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.

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