Analysis by X-ray photoelectron spectroscopy of LnBa2Cu3O7−x: The significance of fine structure in the O 1s and Ba 3d envelopes
- 1 September 1988
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Letters
- Vol. 58 (3) , 139-147
- https://doi.org/10.1080/09500838808214746
Abstract
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 important electronic role 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-T c compounds.Keywords
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