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