Epitaxial Sr₂RuO₄ heterostructures
Madhavan, S.; Ying Liu; Schlom, D.G.; Dabkowski, A.; Dabkowska, H.A.; Suzuki, Y.; Takeuchi, I.; Trajanovic, Z.; Sharma, R.P.
Applied Superconductivity, IEEE Transactions on
Volume 7, Issue 2, Jun 1997 Page(s):2063 - 2066
Digital Object Identifier   10.1109/77.620996
Summary:Sr₂RuO₄ is the only known layered perovskite that is free of copper, yet superconducting. Its low metallic resistivity and excellent lattice match with YBa₂Cu₃ O_7-δ make it an attractive candidate for use as conductive electrodes to YBa₂Cu₃O_7-δ -based superconducting devices or as a normal metal in YBa₂ Cu₃O_7-δ-based SNS junctions. We have determined optimal deposition conditions for growth of single-domain epitaxial films of Sr₂RuO₄. Films with excellent crystallinity are readily grown at substrate temperatures exceeding 1000°C at low pressures. At lower temperatures and higher pressures, films predominantly consist of the SrRuO₃ phase. Resistivity versus temperature measurements reveal that the as-grown Sr₂RuO₄ films are metallic, but not superconducting. Epitaxial YBa₂Cu₃O_7-δ /Sr₂RuO₄ heterostructures have also been grown. X-ray and resistivity measurements show that the YBa₂Cu₃O_7-δ films are of high quality

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