Analysis by X-ray photoelectron spectroscopy of LnBa2Cu3O7−x: The significance of fine structure in the O 1s and Ba 3d envelopes
作者:
P.C. Healy,
S. Myhra,
J.C. Riviere,
A.M. Stewart,
J.G. Thompson,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1988)
卷期:
Volume 58,
issue 3
页码: 139-147
ISSN:0950-0839
年代: 1988
DOI:10.1080/09500838808214746
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Observations by X-ray photoelectron spectroscopy on LnBa2Cu3O7−x(Ln = Y and Ho) show that there are no significant surface electronic differences as a result of substitution of Y by Ho. The O 1s and Ba 3d envelopes exhibit fine structure which appears to be related to significant electronic and structural properties of the 1–2–3 compounds. Namely, the low-binding-energy component of the O 1s envelope is due to Ba─o bonding as well as being specific to the electronic linkage of the Cu layers in the orthorhombic structure. The anomalous low-binding-energy contribution to the Ba 3d envelope suggests that Ba may play an importantelectronicrole as well as a structural role. There is further evidence that Sr and Ca play similar roles in the related Bi─Sr─Ca─Cu─O high-Tccompounds.
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