High-quality epitaxial YBCO thin films directly on LiNbO₃

P. Tiwari Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

X. D. Wu Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

S. R. Foltyn Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

R. E. Muenchausen Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

P. N. Arendt Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

I. H. Campbell Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

Q. X. Jia Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

D. E. Peterson Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, USA

T. E. Mitchell Center for Materials Science, Los Alamos National Laboratory, Los Alamos, NM, USA

D. Face Experimental Station, DuPont Company, Wilmington, DE, USA

D. B. Laubacher Experimental Station, DuPont Company, Wilmington, DE, USA

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Abstract

Pulsed laser deposition was used to deposit high-quality YBa₂Cu₃O_7-δ (YBCO) thin films directly on y-cut LiNbO₃ substrates. The as-deposited YBCO films had a high degree of in-plane orientation and showed superconducting transition temperature (T _co) at 91 K with a transition width of less than 1 K. Transport critical current densities were found to be ∼ 10⁶ A cm⁻² at 77 K and zero field. An ion beam minimum channelling yield of 16% was obtained for YBCO films, indicating high crystallinity. High-resolution transmission electron microscopy studies showed that interface between the film and the substrate was quite smooth and free from interfacial interdiffusion. The defects in thin films are also identified. The work showed that high-quality high T _c thin films can be deposited directly on LiNbO₃. Novel devices based on the properties of both YBCO and LiNbO3 could be realized based on these results.

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High-quality epitaxial YBCO thin films directly on LiNbO₃

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High-quality epitaxial YBCO thin films directly on LiNbO3

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High-quality epitaxial YBCO thin films directly on LiNbO₃