Skip to main content

Research Repository

Advanced Search

Numerical studies on the effect of normal-metal coatings on the magnetization characteristics of type-II superconductors

Carty, G.J.; Machida, M.; Hampshire, D.P.

Numerical studies on the effect of normal-metal coatings on the magnetization characteristics of type-II superconductors Thumbnail


Authors

G.J. Carty

M. Machida

D.P. Hampshire



Abstract

Magnetic properties of superconductors coated with metals of arbitrary resistivity rho(N) are calculated using the time-dependent Ginzburg-Landau equations in which both T-c and rho(N) vary. As rho(N) in the coating is reduced, the initial vortex penetration field H-p(rho(N)) does not decrease monotonically from the insulating (Matricon) limit to the extreme metallic (Bean-Livingston) limit, but has a minimum value H-p(min) below the extreme metallic value. The minimum occurs because the barrier is weakened by proximity-effect penetration of superelectrons into the coating which only occurs at finite resistivity. In an applied magnetic field, local depressions in psi nucleate in the coating which do not have the well-known quantum of magnetic flux (h/2e) until they have crossed the coating and entered the interior of the superconductor. When T=0 and T-c of the normal metal coating is zero, the minimum vortex penetration field H(p(min))approximate to 0.76 kappa(-1.17)H(c2) which occurs for a coating resistivity rho(N)approximate to 1.1 kappa(-0.6)rho(S). For T>0 the minimum is attenuated. Adding a thick weakly superconducting S' layer between the superconductor and normal metal coating reduces the irreversibility markedly.

Citation

Carty, G., Machida, M., & Hampshire, D. (2005). Numerical studies on the effect of normal-metal coatings on the magnetization characteristics of type-II superconductors. Physical review B, 71(14), https://doi.org/10.1103/physrevb.71.144507

Journal Article Type Article
Publication Date 2005-04
Deposit Date May 22, 2008
Publicly Available Date Sep 20, 2010
Journal Physical Review B
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 71
Issue 14
DOI https://doi.org/10.1103/physrevb.71.144507
Keywords Ginzburg-Landau equation, Surface-barrier, Pinning dynamics ,Critical-field, Mixed-state, Temperature, Simulation, Alloys, Vortices, Niobium.

Files

Published Journal Article (422 Kb)
PDF

Copyright Statement
© 2003 by The American Physical Society. All rights reserved.



Downloadable Citations