G.J. Carty
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.
Authors
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. |
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© 2003 by The American Physical Society. All rights reserved.