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Proceedings Paper

Study of epitaxial YBa2Cu3Ox films
Author(s): Soon-Gul Lee; Cheng-Chung John Chi; Gabriel Koren; Arunava Gupta; Armin Segmueller
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Paper Abstract

In this report we present a systematic study of epitaxial YBa2Cu3O films laser ablated on Y-cut LiNbO3 substrates. X-ray diffraction pattern indicates that the c-axis is perpendicular to the substrate plane and the (110) direction of the film is parallel to the [11.0] of the substrate with two domains with the (1 10) as a mirror plane. Resistivity of the film shows a typical metallic behaviour in the normal state with a sharp transition at 92K. The effects of oxygen deficiency on the resistivity are also studied. Oxygen content is controlled by annealing the sample either in low oxygen pressure or in vacuum and estimated from the c-axis lattice parameter determined by X-ray diffraction. As oxygen is depleted gradually, the film resistivity shows metallic, semiconducting, and eventually insulating behaviors. Superconducting percolation phenomenon is observed for the semiconducting sample at low temperatures.

Paper Details

Date Published: 1 October 1990
PDF: 7 pages
Proc. SPIE 1287, High Tc Superconductivity: Thin Films and Applications, (1 October 1990); doi: 10.1117/12.20879
Show Author Affiliations
Soon-Gul Lee, IBM/Thomas J. Watson Research (United States)
Cheng-Chung John Chi, IBM/Thomas J. Watson Research (United States)
Gabriel Koren, IBM/Thomas J. Watson Research (France)
Arunava Gupta, IBM/Thomas J. Watson Research (United States)
Armin Segmueller, IBM/Thomas J. Watson Research (United States)

Published in SPIE Proceedings Vol. 1287:
High Tc Superconductivity: Thin Films and Applications
Cheng-Chung John Chi; R. Bruce van Dover, Editor(s)

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