Orthorhombic YBa2Cu3O7Cleaved Single Crystal by XPS
作者:
D. E. Fowler,
D. C. Miller,
期刊:
Surface Science Spectra
(AIP Available online 1992)
卷期:
Volume 1,
issue 4
页码: 381-392
ISSN:1055-5269
年代: 1992
DOI:10.1116/1.1247637
出版商: American Vacuum Society
关键词: YTTRIUM OXIDES;BARIUM OXIDES;COPPER OXIDES;QUATERNARY COMPOUNDS;CUPRATES;HIGH−TC SUPERCONDUCTORS;PHOTOELECTRON SPECTROSCOPY;X RADIATION;MONOCRYSTALS;CLEAVAGE
数据来源: AIP
摘要:
X-ray photoemission spectra from the cleaved surface of a single crystal of the high temperature superconductor, YBa2Cu3O7, are presented. All spectra were taken with the sample at room temperature. The spectra of this material are dependent on which cleavage planes are exposed following crystal fracture. Extremes in the spectra are given from the continuum of observed surfaces. These extremes are obtained from cleaves leaving large macroscopic terrace planes (larger than probe size), and from cleaves leaving highly stepped surfaces with microscopic terraces (smaller than the probe size). A distinct Fermi edge is observed in the valence band. The freshly cleaved surface is free from contamination, but the spectral line shape of O 1schanges with time. This may be related to the formation of contamination compounds and/or a chemical bonding instability at the cleaved surface of the superconductor.
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