Enhanced Vortex Damping by Eddy Currents in Superconductor-Semiconductor Hybrids

M. Danckwerts; A. R. Goñi; C. Thomsen; K. Eberl; A. G. Rojo

doi:10.1103/PhysRevLett.84.3702

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Enhanced Vortex Damping by Eddy Currents in Superconductor-Semiconductor Hybrids

M. Danckwerts, A. R. Goñi, C. Thomsen, K. Eberl, A. G. Rojo

DOI 10.1103/PhysRevLett.84.3702 · Physical Review Letters

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Abstract

An enhancement of vortex-motion damping in thin Pb/In superconducting films is obtained through coupling to an adjacent two-dimensional electron gas formed in a modulation-doped GaAs/AlGaAs heterostructure. This effect is observed by monitoring the power dissipation in the superconductor in the vortex state while increasing the density of the electron gas using a gate voltage. Quantitative agreement is found with calculations based on a viscous damping model which considers generation of eddy currents in the electron gas by moving flux lines. In the regime of filamentary vortex flow, eddy-current damping leads to a striking dissipation breakdown due to the stopping of entire vortex channels.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PbIn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure unresolved	onset