Enhanced flux pinning in YBa2Cu3O7-d films by nano-scaled substrate surface roughness

Zuxin Ye; W. D. Si; Qiang Li; Y. Hu; P. D. Johnson; Y. Zhu

doi:10.1063/1.2051794

Enhanced flux pinning in YBa2Cu3O7-d films by nano-scaled substrate surface roughness

Superconductivity 2009-11-11 v1 Materials Science

Authors: Zuxin Ye , W. D. Si , Qiang Li , Y. Hu , P. D. Johnson , Y. Zhu

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Abstract

Nano-scaled substrate surface roughness is shown to strongly influence the critical current density Jc in YBCO films made by pulse-laser-deposition on the crystalline LaAlO3 substrates consisting of two separate twin-free and twin-rich regions. The nano-scaled corrugated surface was created in the twin-rich region during the deposition process. Using magneto-optical imaging techniques coupled with optical and atomic force microscopy, we observed an enhanced flux pinning in the YBCO films in the twin-rich region, resulted in \~30% increase in Jc, which was unambiguously confirmed by the direct transport measurement.

Keywords

flux pinning critical current density YBCO films substrate surface roughness pulse laser deposition magneto-optical imaging

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@article{arxiv.cond-mat/0508537,
  title  = {Enhanced flux pinning in YBa2Cu3O7-d films by nano-scaled substrate surface roughness},
  author = {Zuxin Ye and W. D. Si and Qiang Li and Y. Hu and P. D. Johnson and Y. Zhu},
  journal= {arXiv preprint arXiv:cond-mat/0508537},
  year   = {2009}
}

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16 pages, 3 figures, accepted by Applied Physics Letters

Enhanced flux pinning in YBa2Cu3O7-d films by nano-scaled substrate surface roughness

Abstract

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