Abstract:
A model is proposed for vortex pinning in a superconducting film with a rough surface. The model relates the critical current to the steepness of the surface relief and, at a high vortex concentration, to the distance between neighboring steepness maxima on the paths of vortex motion. The dependence of the critical current density on the thickness of a high-Tc superconducting film is measured in a weak magnetic field. Its behavior can be explained by the pinning at the stepped surface relief.
Citation:
A. I. Kosse, Yu. E. Kuzovlev, G. G. Levchenko, Yu. V. Medvedev, A. Yu. Prokhorov, V. A. Khokhlov, P. N. Mikheenko, “Geometrical surface vortex pinning in superconducting films”, Pis'ma v Zh. Èksper. Teoret. Fiz., 78:6 (2003), 832–836; JETP Letters, 78:6 (2003), 379–383
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