Abstract

Direct evidence of two-dimensional (2D) nucleation and growth mode in laser-ablated c-axis YBa 2Cu 3O 7−δ film deposited on (1 0 0) LaAlO 3 substrate was observed. The film consisted of uniform rectangleshaped grains aligning well along the directions of in-plane a b - axes . The surface of the film was free of growth spirals and almost free of droplets. It showed that the 2D-nucleation and growth mode dominated the entire film deposition process. The film had J c values in the order of 10 6 A/cm 2 at 77 K, implying that unknown pinning centers other than the screw dislocations should exist.

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