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

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

2005-08-22

arxiv.org/abs/cond-mat/0508537v1

Applied Physics Letters, Vol. 87, 122502 (2005)

Physics

Condensed Matter

Superconductivity

16 pages, 3 figures, accepted by Applied Physics Letters

Scientific paper

10.1063/1.2051794

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.

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