Staircase magnetization anomalies in superconducting Pb/Au bilayer films patterned with antidot lattices |
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| Authors: | Lance E. De Long S.A. Kryukov V. Bhat V.V. Metlushko M.J.A. Stoutimore D.J. Van Harlingen |
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| Affiliation: | 1. Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA;2. Department of Electrical and Computer Engineering, University of Illinois-Chicago, Chicago, IL 60607-0024, USA;3. Department of Physics, University of Illinois-Urbana-Champaign, Urbana, IL 61801-3080, USA |
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| Abstract: | Superconducting Pb(x)/Au(25 nm) bilayers (x = 50, 100 nm) patterned with antidot lattices exhibit various matching field anomalies depending on experimental conditions. Magnetization peaks at applied fields H = n[20 Oe] (n = integer) resemble superconducting wire network data; cusps are also observed, consistent with predictions of “giant” vortices in low-kappa films. Sharp “staircase” anomalies spaced by 1–3 Oe are observed in AC magnetization, possibly a result of depinning of intermediate state domains, or macroscopic quantum tunneling between reproducible states of different quantized flux. |
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| Keywords: | Vortex phases Vortex pinning Proximity effects Superconducting wire networks Macroscopic quantum tunneling Intermediate state |
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