Staircase magnetization anomalies in superconducting Pb/Au bilayer films patterned with antidot lattices

Lance E. De Long, S. A. Kryukov, V. Bhat, V. V. Metlushko, M. J.A. Stoutimore, Dale J Van Harlingen

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)739-743
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume470
Issue number19
DOIs
StatePublished - Oct 1 2010

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Keywords

  • Intermediate state
  • Macroscopic quantum tunneling
  • Proximity effects
  • Superconducting wire networks
  • Vortex phases
  • Vortex pinning

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials

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