Theory of rf magnetic permeability of isotropic type-II superconductors in a parallel field
Mark W. Coffey, John R. Clem
DOI 10.1103/PhysRevB.45.9872 · Physical Review B
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Abstract
A theoretical description of the complex rf magnetic permeability μ̃=μ’+iμ’’ of isotropic type-II superconductors in a parallel applied static magnetic field is presented. The results are based upon a self-consistent treatment of vortex dynamics which simultaneously includes the effects of pinning, flux flow, and flux creep, together with nonlocal vortex interactions. The results are expected to be valid over a wide range of frequencies, magnetic inductions, and temperatures. We show how a μ’’-peak line, closely related to the irreversibility line, arises from the theoretical result for the permeability as a function of temperature, magnetic field, and frequency. This theory opens the possibility of investigating flux creep and depinning at frequencies into the GHz range.
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