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
TL;DR
This study demonstrates a direct correlation between the critical temperature (Tc) and the CuO2 bilayer spacing in YBa2Cu3O7-x, influenced by epitaxial strain and oxygen content, using advanced spectroscopic and diffraction techniques.
Contribution
It reveals a novel direct correlation between Tc and CuO2 bilayer spacing in YBCO, highlighting the impact of strain and oxygenation on superconducting properties.
Findings
Tc correlates directly with CuO2 bilayer separation.
Strain and deoxygenation induce underdoping in YBCO layers.
High-resolution EELS and X-ray diffraction elucidate structural and electronic changes.
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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