Meissner-like Response of Type-II Superconductors in the Mixed State
G. D'Anna
DOI 10.1103/PhysRevLett.76.1924 · Physical Review Letters
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Abstract
Vortex pinning and vortex cutting are included in a continuum theory for the mixed state of type-II superconductors. It is then shown that when the transport current in a field-cooled sample is increased from zero, the initial stage is always a Meissner-like surface current. In this stage the vortices remain straight, while close to the surface the field lines bend (when the current is perpendicular to the vortices) or twist (when the current is parallel to the vortices). Only when the threshold for vortex depinning or vortex cutting is reached at the surface, a critical state builds up, or, possibly, the current flow becomes resistive.
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