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RESEARCH PRODUCT
Depinning frequency in a heavily neutron-irradiated MgB2 sample
Marco BonuraAlberto MartinelliA. Agliolo GallittoM. Li Vignisubject
SuperconductivityFlux pinningMaterials scienceCondensed matter physicsBand gapCondensed Matter - Superconductivitysuperconductivity microwave surface resistance mgb2CRITICAL-STATEEnergy Engineering and Power TechnologyField dependenceFOS: Physical sciencesII SUPERCONDUCTORSCondensed Matter PhysicsSample (graphics)RF MAGNETIC-PERMEABILITYElectronic Optical and Magnetic MaterialsSuperconductivity (cond-mat.supr-con)Surface conductivityTEMPERATURE-DEPENDENCECondensed Matter::SuperconductivityNeutronIrradiationElectrical and Electronic EngineeringMICROWAVE SURFACE-RESISTANCEdescription
The magnetic-field-induced variations of the microwave surface resistance have been investigated in a heavily neutron-irradiated MgB2 sample, in which the irradiation has caused the merging of the two gaps into a single value. The experimental results have been analyzed in the framework of the Coffey and Clem model. By fitting the experimental data, we have determined the field dependence of the depinning frequency, omega_0, at different values of the temperature. Although the pinning is not particularly effective, the value of omega_0 obtained at low temperatures is considerably higher than that observed in conventional low-temperature superconductors.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-09-19 |