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29 March 2024
 
  » arxiv » cond-mat/0204535

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Superconducting Transition and Vortex Pinning in Nb Films Patterned with Nano-scale Hole-arrays
U. Welp ; Z. L. Xiao ; J. S. Jiang ; V. K. Vlasko-Vlasov ; S. D. Bader ; G. W. Crabtree ; J. Liang ; H. Chik ; J. M. Xu ;
Date 24 Apr 2002
Subject Superconductivity | cond-mat.supr-con
Affiliation MSD, Argonne Nat Lab, Dept. of Physics, Brown Univ.
AbstractNb films containing extended arrays of holes with 45-nm diameter and 100-nm spacing have been fabricated using anodized aluminum oxide (AAO) as substrate. Pronounced matching effects in the magnetization and Little-Parks oscillations of the superconducting critical temperature have been observed in fields up to 9 kOe. Flux pinning in the patterned samples is enhanced by two orders of magnitude as compared to unpatterned reference samples in applied fields exceeding 5 kOe. Matching effects are a dominant contribution to vortex pinning at temperatures as low as 4.2 K due to the extremely small spacing of the holes.
Source arXiv, cond-mat/0204535
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