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American Physical Society, Physical Review B (Condensed Matter), 13(66), 2002

DOI: 10.1103/physrevb.66.134517

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Direct correlation betweenTcandCuO2bilayer spacing inYBa2Cu3O7−x

Journal article published in 2002 by M. Varela ORCID, D. Arias, Z. Sefrioui, C. León, C. Ballesteros, S. J. Pennycook, J. Santamaria
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This paper is available in a repository.

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Abstract

We report the effects of epitaxial strain and deoxygenation on high quality [YBa2Cu3O7-x(YBCO)N/PrBa2Cu3O7(PBCO)5]1000Å superlattices, with 1<N<12 unit cells. High-spatial-resolution electron energy loss spectroscopy 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 separation of the CuO2 bilayers.