Enhanced vortex damping by eddy currents in superconductor-semiconduc tor hybrids

Details Enhanced vortex damping by eddy currents in superconductor-semiconduc tor hybrids Enhanced vortex damping by eddy currents in superconductor-semiconduc tor hybrids

2000-01-10

arxiv.org/abs/cond-mat/0001123v1

Physics

Condensed Matter

Superconductivity

4 figures

Scientific paper

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 at 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 model of vortex damping which considers generation of eddy currents in the electron gas by moving flux lines. In the regime of filamentary and channel vortex flow, eddy-current damping leads to striking dissipation breakdown due to stopping of entire vortex channels.

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