Electrostatics of Vortices in Type-II Superconductors

Electrostatics of Vortices in Type-II Superconductors.

In a type II superconductor the gap variation in the core of a vortex line induces a local charge modulation. Accounting for metallic screening, we determine the line charge of individual vortices and calculate the electric field distribution in the half space above a field penetrated superconductor. The resulting field is that of an atomic size dipole d ∼ eaBẑ, aB = h̄/me is the Bohr radius, ac...

Motion of Vortices in Type II Superconductors

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Absence of dipole transitions in vortices of type-II superconductors.

The response of a single vortex to a time dependent field is examined microscopically and an equation of motion for vortex motion at non-zero frequencies is derived. Of interest are frequencies near ∆/EF , where ∆ is the bulk energy gap and EF is the fermi energy. The low temperature, clean, extreme type II limit and maintaining of equilibrium with the lattice are assumed. A simplification occu...

Motion and Homogenization of Vortices in Anisotropic Type II Superconductors

The motion of vortices in an anisotropic superconductor is considered. For a system of well-separated vortices, each vortex is found to obey a law of motion analogous to the local induction approximation, in which velocity of the vortex depends upon the local curvature and orientation. A system of closely packed vortices is then considered, and a mean field model is formulated in which the indi...

Interaction of ultrasound with vortices in type-II superconductors.