Quantum collective creep

1991/06/24 by G. Blatter, V. B. Geshkenbeǐn, Valeri M. Vinokur · 1 voice
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena

paper · doi:10.1103/physrevlett.66.3297

openalex publication_date 1991/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/11

Abstract

We study the phenomenon of quantum creep in bulk superconductors within the framework of weak-collective-pinning theory. Single-vortex pinning at moderate magnetic fields as well as creep of vortex bundles at high fields are discussed for the case of current densities near critical. In the limit of strong dissipation and for moderate fields the basic parameter determining the tunneling rate is the ratio \mathrm\ensuremathρ_n/\ensuremathξ (\mathrm\ensuremathρ_n=normal-state resistivity, \ensuremathξ=coherent length), with strong tunneling realized for \mathrm\ensuremathρ_h/\ensuremathξ\ensuremath\gtrsim1 k\ensuremathΩ.

Discussions

• Flux/phase tunneling in SQUIDs. We escape from the zero voltage state and resonant tunneling between fluxoid wells in dc/rf SQUID potentials. Theres a clear crossover from thermal activation to MQT at [stackexchange, 4 points]

Related

• Quantum creep in layered antiferromagnetic superconductor
• Creep effects on the Campbell response in type II superconductors
• Non-universal tunneling resistance at the quantum critical point of mesoscopic SQUIDs array
• Creep motions of flux lines in type II superconductors with point-like defects
• The critical current density in type-II superconducting bulk materials