6533b85efe1ef96bd12bfcc2

RESEARCH PRODUCT

Fluxon dynamics by microwave surface resistance measurements in MgB2

S. FricanoGiovanni GiunchiA. Agliolo GallittoM. Li VigniMarco Bonura

subject

SuperconductivityPhysicsFluxonCondensed matter physicsCondensed Matter - SuperconductivityFOS: Physical sciencesEnergy Engineering and Power TechnologyTourbillonMgB2 Microwave surface impedance Fluxon dynamicsCondensed Matter PhysicsMagnetic fluxElectronic Optical and Magnetic MaterialsVortexSuperconductivity (cond-mat.supr-con)Surface conductivityCondensed Matter::SuperconductivityElectrical and Electronic EngineeringAnisotropyCritical field

description

Field-induced variations of the microwave surface resistance, Rs(H), have been investigated in high-density ceramic MgB2. At low temperatures, several peculiarities of the Rs(H) curves cannot be justified in the framework of models reported in the literature. We suggest that they are ascribable to the unconventional vortex structure in MgB2, related to the presence of two gaps. On the contrary, the results near Tc can be accounted for by the Coffey and Clem model, with fluxons moving in the flux-flow regime, provided that the anisotropy of the upper critical field is taken into due account.

yearjournalcountryeditionlanguage
2003-09-29Physica C: Superconductivity
https://doi.org/10.1016/j.physc.2003.09.103