Collapse of the critical state in superconducting niobium

Abstract

Giant abrupt changes in the magnetic flux distribution in niobium foils were studied by using magneto-optical visualization, thermal and magnetic measurements. Uniform flux jumps and sometimes almost total catastrophic collapse of the critical state are reported. Results are discussed in terms of thermomagnetic instability mechanism with different development scenarios.

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• Quasiparticle spectroscopy, transport, and magnetic properties of Nb films used in superconducting transmon qubits
• Local-moment ferromagnetism and unusual magnetic domains in Fe${}_{1/4}$TaS${}_2$ crystals
• Flux avalanches in Nb superconducting shifted strip arrays
• Vortex Dynamics and Dissipation Under High-amplitude Microwave Drive
• Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets
• Current-induced magnetization hysteresis defines atom trapping in a superconducting atomchip
• The nontrivial effects of annealing on superconducting properties of Nb single crystals
• Quasiparticle spectroscopy in technologically-relevant niobium using London penetration depth measurements