Vortex instability in molybdenum-germanium superconducting films
Manlai Liang, Milind N. Kunchur
TL;DR
This paper investigates vortex instability in amorphous molybdenum-germanium superconducting films under high current, confirming the Larkin-Ovchinikov model and measuring energy relaxation rates consistent with theoretical predictions.
Contribution
It provides experimental validation of the LO vortex instability model in MoGe films and measures quasiparticle energy relaxation rates matching theory.
Findings
Nonlinear current-voltage response conforms with LO model.
Energy relaxation rate matches theoretical predictions.
Flux flow becomes unstable at high driving forces.
Abstract
We studied the high driving force regime of the current-voltage transport response in the mixed state of amorphous molybdenum-germanium superconducting films to the point where the flux flow becomes unstable. The observed nonlinear response conforms with the classic Larkin-Ovchinikov (LO) picture with a quasiparticle-energy-relaxation rate dominated by the quasiparticle recombination process. The measured energy relaxation rate was found to have a magnitude and temperature dependence in agreement with theory. PACS: 74.40.Gh, 74.25.Uv, 72.15.Lh, 73.50.Gr, 73.50.Fq Keywords: fluxon, vortices, TDGL, FFF, negative differential conductivity, NDC, non-monotonic IV curve
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