Microscopic model for multiple flux transitions in mesoscopic superconducting loops
arXiv:cond-mat/0606545 · doi:10.1209/epl/i2006-10112-y
Abstract
A microscopic model is constructed which is able to describe multiple magnetic flux transitions as observed in recent ultra-low temperature tunnel experiments on an aluminum superconducting ring with normal metal - insulator - superconductor junctions [Phys. Rev. B \textbf{70}, 064514 (2004)]. The unusual multiple flux quantum transitions are explained by the formation of metastable states with large vorticity. Essential in our description is the modification of the pairing potential and the superconducting density of states by a sub-critical value of the persistent current which modulates the measured tunnel current. We also speculate on the importance of the injected non-equilibrium quasiparticles on the stability of these metastable states.
6 pages, 3 figures
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- Density of states in a superconductor carrying a supercurrent
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Cited by in corpus (9)
- Quantum phase slip phenomenon in ultra-narrow superconducting nanorings
- Magnetic Response in Mesoscopic Hubbard Rings: A Mean Field Study
- Relaxation of Nonequilibrium Quasiparticles in Mesoscopic Size Superconductors
- On the way to meet the experimental observation of persistent current in a mesoscopic cylinder: A mean field study
- Fluxoid fluctuations in mesoscopic superconducting rings
- Magneto-transport in mesoscopic rings and cylinders: Effects of electron-electron interaction and spin-orbit coupling
- Interplay of charge and vorticity quantization in superconducting Coulomb blockaded island
- Tunneling spectroscopy of persistent currents in superconducting microrings
- Suppression of diamagnetism in superconducting nanorings by quantum fluctuations