American Physical Society, Physical Review B (Condensed Matter), 13(66), 2002
DOI: 10.1103/physrevb.66.134517
Full text: Download
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.