Optical characterization of surface and interface oxygen content in YBa2Cu3Ox

5 December 1988

journal article
conference paper
Published by AIP Publishing in Applied Physics Letters

Vol. 53 (23) , 2333-2335
https://doi.org/10.1063/1.100516

Abstract

Because YBa₂Cu₃O_x exists over a range of oxygen content and low oxygen material is nonsuperconducting, it is important to be able to measure and control this parameter for application purposes. We present an optical technique for determining oxygen loss at surfaces and interfaces, where processing and contacts with other materials may affect composition and where usual techniques are insensitive. Using a strong absorption feature at 4.1 eV which appears at low oxygen composition, we find that overlayers of Al and In remove oxygen from YBa₂Cu₃O_x, but Ag, Au, and room‐temperature exposure to moderate vacuum do not.

Keywords

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