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RESEARCH PRODUCT

Influence of magnetic field on cooling by normal-insulator–superconductor junctions

Jukka P. PekolaT. I. SuppulaK. Yu. ArutyunovJ. K. Suoknuuti

subject

PhysicsParamagnetismFlux pumpingCondensed matter physicsMagnetic energyMeissner effectCondensed Matter::SuperconductivityDemagnetizing fieldGeneral Physics and AstronomyDiamagnetismMagnetic pressureLittle–Parks effect

description

Cooling by normal-insulator–superconductor junctions in external magnetic field has been studied experimentally. For all orientations of magnetic field the cooling performance correlates with the magnetic field dependent superconducting energy gap Δ(H). In perpendicular orientation of magnetic field with respect to the sample plane, additional degradation of the cooling power originates from scattering of nonequilibrium quasiparticles in the superconductor on magnetic vortices. The effect is hysteretic and its magnitude depends on the shape of the superconducting probes.

https://doi.org/10.1063/1.373661