2005/05/28 by Oskar Vafek, Vafek, Oskar, M. R. Beasley +3 · 1 citation
Physics and Astronomy · #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Surface and Thin Film Phenomena #Theoretical and Computational Physics #cond-mat.dis-nn #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0505688
4 pages; 1 figure
openalex publication_date 2005/05/28 · arxiv created 2005/05/29 · arxiv updated 2009/12/01 · openalex created_date 2022/10/05 · openalex updated_date 2026/07/28
We study the flux-driven superconductor-metal transition in ultrasmall\ncylinders observed experimentally by Liu em et.al.(Science 294, 2332\n(2001)). Where Tc\→ 0, there is a quantum critical point, and a large\nfluctuation conductivity is observed in the proximate metallic phase over a\nwide range of T and flux . However, we find that the predicted (Gaussian)\nfluctuation conductivity in the neighborhood of the quantum critical point is 4\norders of magnitude smaller than observed experimentally. We argue that the\nbreakdown of Anderson's theorem at any non-integer flux leads to a broad\nfluctuation region reflecting the existence of ``rare regions'' with local\nsuperconducting order. We calculate the leading order correction to the\nconductivity within a simple model of statistically induced Josephson coupled\nlocal ordered regions that rationalizes the existing data.\n