Oxygen defect in YBa₂Cu₃O_x: An x-ray photoemission approach

Authors

W.K. Ford, Montana State University - Bozeman
C.T. Chen, AT&T Bell Laboratories, Murray Hill, New Jersey
J. Anderson, Montana State University - Bozeman
J. Kwo, AT&T Bell Laboratories, Murray Hill, New Jersey
Sy_Hwang Liou, University of Nebraska-LincolnFollow
M. Hong, Montana State University - Bozeman
G.V. Rubenacker, Montana State University - Bozeman
J.E. Drumheller, Montana State University - Bozeman

Date of this Version

May 1988

Comments

Published by American Physical Society. Phys. Rev. B37, 7924 (1988). http://prb.aps.org. Copyright © 1988 American Physical Society. Permission to use.

Abstract

A combined x-ray photoemission and diamagnetic-susceptibility study of YBa₂Cu₃O_x with x≃6 and 7 has been performed, with emphasis on the oxygen defect and the effect of heating in vacuum. By comparing spectra taken at these two oxygen contents, the core levels observed in the O 1s and Ba 4d spectral range are identified. Peak-intensity analysis indicates (1) that the oxygen released during the in situ heating is derived from or near the Cu-O-Cu-O chains of YBa₂Cu₃O₇ and (2) that there is a random distribution of oxygen defects in or near these chains leading to two chemically dissimilar barium atoms even in single-orthorhombic-phase samples.