Critical-state effects on microwave losses in type-II superconductors

We discuss the microwave energy losses in superconductors in the critical state. The field-induced variations of the surface resistance are determined, in the framework of the Coffey and Clem model, by taking into account the distribution of the vortex magnetic field inside the sample. It is shown t...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2006-08, Vol.52 (4), p.459-463
Main Authors: BONURA, M, DI GENNARO, E, AGLIOLO GALLITTO, A, LI VIGNI, M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Low temperature
Niobium
Physics
Properties of type I and type II superconductors
Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
Superconductivity
Superconductors
Surface resistance
Vortex lattices ,flux pinning, flux creep
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Summary:We discuss the microwave energy losses in superconductors in the critical state. The field-induced variations of the surface resistance are determined, in the framework of the Coffey and Clem model, by taking into account the distribution of the vortex magnetic field inside the sample. It is shown that the effects of the critical state cannot generally be disregarded to account for the experimental data. Results obtained in bulk niobium at low temperatures are quantitatively justified.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2006-00320-9