TWO REGIMES OF VORTEX PENETRATION INTO PLATELET-SHAPED TYPE-II SUPERCONDUCTORS
Brandt E.N., Mikitik G.P., Zeldov E.

Поступила в редакцию: 26 Марта 2013

DOI: 10.7868/S004445101309006X

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Dedicated to the memory of Professor Anatoly Larkin} 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_ap, 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.