Study of epitaxial YBa2Cu3Ox films

Soon-Gul Lee; Cheng-Chung John Chi; Gabriel Koren; Arunava Gupta; Armin Segmueller

doi:10.1117/12.20879

1 October 1990 Study of epitaxial YBa2Cu3Ox films

Soon-Gul Lee, Cheng-Chung John Chi, Gabriel Koren, Arunava Gupta, Armin Segmueller

Proceedings Volume 1287, High Tc Superconductivity: Thin Films and Applications; (1990) https://doi.org/10.1117/12.20879
Event: Advances in Semiconductors and Superconductors: Physics Toward Devices Applications, 1990, San Diego, CA, United States

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.

Citation Download Citation

Soon-Gul Lee, Cheng-Chung John Chi, Gabriel Koren, Arunava Gupta, and Armin Segmueller "Study of epitaxial YBa2Cu3Ox films", Proc. SPIE 1287, High Tc Superconductivity: Thin Films and Applications, (1 October 1990); https://doi.org/10.1117/12.20879

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