Theory of rf magnetic permeability of isotropic type-II superconductors in a parallel field
- 1 May 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (17), 9872-9881
- https://doi.org/10.1103/physrevb.45.9872
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.Keywords
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