Nonlocal Josephson electrodynamics and pinning in superconductors
- Univ. of Wisconsin, Madison, WI (United States)
Local Josephson electrodynamics based on the sine-Gordon equation is generalized on the nonlocal case of high critical current density j{sub c} across the contact for which the Josephson penetration depth becomes smaller than the London one. Magnetic flux is shown to penetrate the contact in the form of Abrikosov vortices having highly anisotropic cores much larger than the coherence length. An exact solution describing such a vortex is found; the lower critical field, vortex mass and flux flow resistivity are calculated. It is argued that vortices localized on planar crystalline defects prove to be weakly pinned, therefore any weak links with j{sub c} smaller than the depairing current density form a dissipative network which essentially reduces the critical current of a superconductor.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 127786
- Report Number(s):
- CONF-920376--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 37; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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