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RESEARCH PRODUCT
Magnetic hysteresis in the microwave surface resistance of Nb samples in the critical state
Marco BonuraM. Li VigniA. Agliolo Gallittosubject
Superconductivitycircuit modelCondensed Matter - Materials ScienceMicrowave surface resistanceFlux distributionMaterials scienceCondensed matter physicsCondensed Matter - SuperconductivityVortex flowMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesField dependenceHigh temperature superconductorsCondensed Matter PhysicsMagnetic hysteresisElectronic Optical and Magnetic MaterialsSuperconductivity (cond-mat.supr-con)Condensed Matter::SuperconductivityCritical currentdescription
We discuss the hysteretic behavior of the field-induced variations of the microwave surface resistance in superconductors in the critical state. Measurements have been performed in a bulk sample of Nb and a powdered one at different values of the temperature. We discuss a model, based on the Coffey and Clem theory, in which we take into account the flux distribution inside the sample, due to the critical state. The experimental results are justified quantitatively in the framework of our model. We show that by fitting the experimental data it is possible to determine the value of the critical current density and its field dependence.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-01-01 |