Absence of dipole transitions in vortices of type-II superconductors

Abstract

The response of a single vortex to a time-dependent field is examined microscopically and an equation of motion for vortex motion at nonzero frequencies is derived. Of interest are frequencies near Δ2/EF, where Δ is the bulk energy gap and EF is the Fermi energy. The low-temperature, clean, extreme-type-II limit and maintanance of equilibrium with the lattice are assumed. A simplification occurs for large planar mass anisotropy. Thus the results may be pertinent to materials such as NbSe2 and high-temperature superconductors. The expected dipole transition between core states is hidden because of the self-consistent nature of the vortex potential. Instead the vortex itself moves and has a resonance at the frequency of the transition.

Source-reported materials — not catalogue approval

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