Search results for "Vortex state"

showing 2 items of 12 documents

Microwave Properties of Nb/PdNi/Nb Trilayers

2012

We combine wideband (1-20 GHz) Corbino disk and dielectric resonator (8.2 GHz) techniques to study the microwave properties in Nb/PdNi/Nb trilayers, grown by UHV dc magnetron sputtering, composed by Nb layers of nominal thickness $d_S$=15 nm, and a ferromagnetic PdNi layer of thickness $d_F$= 1, 2, 8 and 9 nm. We focus on the vortex state. Magnetic fields up to $H_{c2}$ were applied. The microwave resistivity at fixed $H/H_{c2}$ increases with $d_F$, eventually exceeding the Bardeen Stephen flux flow value.

SuperconductivityMaterials scienceStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsCondensed Matter - SuperconductivityFOS: Physical sciencesDielectric resonatorSputter depositionCondensed Matter PhysicsVortex stateElectronic Optical and Magnetic MaterialsMagnetic fieldSuperconductivity (cond-mat.supr-con)Condensed Matter - Strongly Correlated ElectronsFerromagnetismElectrical resistivity and conductivityMicrowaveJournal of Superconductivity and Novel Magnetism
researchProduct

Metastability and hysteresis of the vortex states in rotating superfluid3He-B

1996

We have investigated the vortex core transition in 3He-B by measuring the associated changes in mutual friction dissipation within the superfluid. If rotation is continuously stopped and restarted while cooling or warming then the transition occurs at a clearly defined temperature, but temperature sweeps during continuous rotation show substantial supercooling and superheating. Moreover, the high temperature vortex shows a continuum of metastable states when supercooled to a constant, arbitrary low temperature, the mutual friction dissipaton depending on the temperature at which rotation was started. Our current interpretation is that the high temperature vortex state is a temperature-depen…

SuperfluidityPhysicsSuperheatingContinuous rotationCondensed matter physicsCondensed Matter::SuperconductivityMetastabilityGeneral Physics and AstronomyDissipationSupercoolingVortex stateVortexCzechoslovak Journal of Physics
researchProduct