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Oxygen diffusion at the surface of the highTcsuperconductor YBa2Cu3O7−δ

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0039-6028(92)91397-t
Disciplines
  • Physics

Abstract

Abstract The electronic structure of the superconductor is analyzed as a function of the oxygen content adjusted by reducing and oxidizing anneals. The modifications of the Cu 2p, O 1s, Ba 4d core level lines are found to be reversible and directly related to the presence of oxygen vacancies in the crystallographic structure. Two O-lines and two Ba-doublets specific to the cuprate are detected with variable intensities and extrinsic high binding energy O- and Ba-components are attributed to an oxygen adsorption at the surface of the samples. The texture of the samples varies the relative weight of the extrinsic lines and modifies the kinetic of the oxygen diffusion.

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