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

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

2002-08-29

arxiv.org/abs/cond-mat/0208584v1

Phys. Rev. B 66, 134517 (2002)

Physics

Condensed Matter

Superconductivity

13 pages + 4 figures accepted in Phys. Rev. B, scheduled 1 Oct 2002

Scientific paper

10.1103/PhysRevB.66.134517

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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