Vortex instability in molybdenum-germanium superconducting films

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

5 pages, 3 figures

References in corpus (10)

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• Competition between intrinsic and extrinsic effects in the quenching of the superconducting state in FeSeTe thin films
• Quenching current by flux-flow instability in iron-chalcogenides thin films
• Fast Dynamics of Vortices in Superconductors
• Thermally-activated dynamics of spontaneous perpendicular vortices tuned by parallel magnetic fields in thin superconducting films
• Enhancement of the retrapping current of superconducting microbridges of finite length
• Stability mechanisms of high current transport in iron-chalcogenides superconducting films
• Flow and Tilt-Induced Orientation of the Moving Vortex Lattice in Amorphous NbGe Superconducting Thin Films
• Two-dimensional superconducting diode effect in topological insulator/superconductor heterostructure
• Negative differential resistance state in the free-flux-flow regime of driven vortices in a single crystal of 2H-NbS${}_2$