Two regimes of vortex penetration into platelet-shaped type-II superconductors |
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Authors: | E H Brandt G P Mikitik E Zeldov |
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Institution: | 1. Max-Planck-Institut für Metallforschung, Stuttgart, D-70506, Germany 2. Verkin Institute for Low Temperature Physics & Engineering, Ukrainian Academy of Sciences, Kharkov, 61103, Ukraine 3. Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
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Abstract: | Vortex penetration into a thin superconducting strip of a rectangular cross section is considered at an increasing applied magnetic field H a , taking an interplay between the Bean-Livingston and the geometric barriers in the sample into account. We calculate the magnetic field H p at which the penetration begins and show that two regimes of vortex penetration are possible. In the first regime, vortices appearing at the corners of the strip at H a = H p immediately move to its center, where a vortex dome starts to develop. In the second regime, the penetration occurs in two stages. In the first stage, at H a < H p , tilted vortices penetrate into the edge regions of the strip, where novel domes are shown to be formed at the top, bottom, and lateral surfaces. In the second stage, at H a = H p , the vortex propagation to the center becomes possible. The difference between the regimes manifests itself in slightly different dependences of the magnetic moment of the strip on H a . |
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