Abstract
We have measured the power dissipation in thin Pb/In superconducting films which are coupled to an adjacent two-dimensional electron gas formed in a modulation-doped GaAs/AlGaAs heterostructure. An enhancement of vortex-motion damping at the superconductor is obtained by increasing the density of the electron gas using a gate voltage. Quantitative agreement is found with calculations based on a viscous model of vortex damping which considers the generation of eddy currents in the electron gas by moving flux lines. Eddy-current damping is much more pronounced in the regime of filamentary and channel vortex flow, as compared to the free-flux flow case, leading to striking reductions in dissipation due to stopping of entire vortex channels.
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