Critical state in type-II superconductors with order-disorder transition

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I. M. Babich,^1,2 G. P. Mikitik,^1,2 and E. H. Brandt¹
¹Max-Planck-Institut für Metallforschung, D-70506 Stuttgart, Germany
²B. Verkin Institute for Low Temperature Physics & Engineering, National Ukrainian Academy of Sciences, Kharkov 61103, Ukraine

Received 4 August 2006; published 6 December 2006

Anexplicit analytical solution of the critical-state problem is obtained forlong thin superconducting strips in a perpendicular magnetic field H_awhen a sharp order-disorder transition occurs in the vortex lattice.We model this transition from the quasiordered Bragg glass intothe disordered amorphous vortex phase by a jump of thecritical current density occurring at a value B_dis of thelocal magnetic induction. Explicit expressions are presented for the magnetic-fieldprofiles at the surface of the strip, for the distributionof the sheet current, and for the magnetization loop.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.224501
DOI:	10.1103/PhysRevB.74.224501
PACS:	74.25.Sv; 74.25.Qt 74.25.Sv Critical currents in superconductors 74.25.Qt Vortex lattices, flux pinning, flux creep in superconductors YEAR: 2006
KEYWORDS:	critical current density (superconductivity), superconducting transitions, flux-line lattice, order-disorder transformations, amorphous state, magnetisation

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