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arxiv: cond-mat/0208584 · v1 · submitted 2002-08-29 · ❄️ cond-mat.supr-con

Direct Correlation between Tc and CuO2 Bilayer Spacing in YBa2Cu3O7-x

M. Varela , D Arias , Z. Sefrioui , C. Leon , C. Ballesteros , S. J. Pennycook , J. Santamaria This is my paper
classification ❄️ cond-mat.supr-con
keywords cuo2deoxygenationhighstrainyba2cu3o7-xybcoanalysisbilayer
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We report the effects of epitaxial strain and deoxygenation on high quality [YBa2Cu3O7-x (YBCO)_N / PrBa2Cu3O7 (PBCO)_5] (1000 A thick) superlattices, with 1 <= N <= 12 unit cells. High spatial resolution electron energy loss spectroscopy (EELS) shows that strained, fully oxygenated YBCO layers are underdoped. Irrespective of whether underdoping is induced by strain or deoxygenation, X-ray diffraction analysis shows that Tc correlates directly with the separation of the CuO2 bilayers.

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