ZhETF, Vol. 144,
p. 508 (September 2013)
(English translation - JETP,
Vol. 117, No. 3,
available online at www.springer.com
TWO REGIMES OF VORTEX PENETRATION INTO PLATELET-SHAPED TYPE-II SUPERCONDUCTORS
Brandt E.N., Mikitik G.P., Zeldov E.
Received: March 26, 2013
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 Ha, taking an interplay between the Bean-Livingston and the geometric barriers in the sample into account. We calculate the magnetic field Hp 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 Ha=Hp 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 Hap, 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 Ha=Hp, 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 Ha.