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We report on the growth mechanism of YBa2Cu3O7-x (YBCO). Our study is basedon the analysis of ultrathin, YBa2Cu3O7-x layers in c-axis oriented YBa2Cu3O7-x/ PrBa2Cu3O7-x superlattices. We have found that the release of epitaxialstrain in very thin YBCO layers triggers a change in the dimensionality of thegrowth mode. Ultrathin, epitaxially strained, YBCO layers with thickness below3 unit cells grow in a block by block two dimensional mode coherent over largelateral distances. Meanwhile, when thickness increases, and the strain relaxes,layer growth turns into three dimensional, resulting in rougher layers andinterfaces.Comment: 10 pages + 9 figures, accepted in Phys. Rev.

physical review. b, condensed matter

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Effects of epitaxial strain on the growth mechanism inYBa2Cu3O