Microwave studies of granular superconductivity

Microwave absorption in low magnetic fields is a sensitive contactless indicator of surface granular superconductivity, a significant source of surface resistance. Granularity is also responsible for microwave absorption in the ceramic high-temperature superconductors and in ceramic Chevrel-phase co...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 25; no. 2; pp. 2390 - 2393
Main Authors Portis, A.M., Blazey, K.W.
Format Journal Article
LanguageEnglish
Published IEEE 01.03.1989
Subjects
Ceramics
Contact resistance
Electromagnetic wave absorption
Granular superconductors
High temperature superconductors
Josephson junctions
Magnetic fields
Superconducting films
Surface resistance
Viscosity
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Summary:Microwave absorption in low magnetic fields is a sensitive contactless indicator of surface granular superconductivity, a significant source of surface resistance. Granularity is also responsible for microwave absorption in the ceramic high-temperature superconductors and in ceramic Chevrel-phase compounds. Modulated microwave adsorption signals from granular ceramics show critical behavior with pinning and depinning of intergranular flux over a modulation cycle. In single crystal YBa/sub 2/Cu/sub 3/O/sub 7- delta / the adsorption arises from the motion of flux within twin-plane domain boundaries. Modulated adsorption signals from these domain boundaries show additional adsorption from fluxon nucleation above critical levels of microwave current. Such losses may contribute significantly to microwave adsorption in zero magnetic field.< >
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ISSN:0018-9464
1941-0069
DOI:10.1109/20.92788