Ba core-level shift in x-ray photoemission spectroscopy on single-phase and compounds
- 1 May 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 41 (13), 8921-8926
- https://doi.org/10.1103/physrevb.41.8921
Abstract
We have measured x-ray photoemission spectra of single-phase (x=0.0, 0.2, 0.4, 0.6, 0.8) and of (y=0.0, 0.15, 0.40) compounds, in which superconductivity is suppressed by increasing x and y. Ba 3d and Ba 4d core-level spectra were observed to shift significantly towards higher binding energy as x and y increase, while Y 3d, Cu 3p, O 1s spectra were not. The shift of Ba core-level spectra is interpreted as resulting from a distinct initial-state Ba 5d–Od 2p covalency common to 1:2:3 structures, as opposed to final-state effects. This energy shift may constitute a sensitive fingerprint of the degree of hole localization at Ba sites, which is related to the quenching of superconductivity in these compounds.
Keywords
This publication has 21 references indexed in Scilit:
- Role of oxygen in : Effect on structural and physical propertiesPhysical Review B, 1990
- Magnetic ordering and superconductivity inPhysical Review B, 1989
- Upper critical field and normal-state properties of single-phase compoundsPhysical Review B, 1989
- Preparation and Raman analysis of single-phasePhysical Review B, 1989
- 4f Electron effects in high Tc RBa2Cu3O7 − δ (R = rare earth) superconductorsJournal of the Less Common Metals, 1989
- Electronic structure of the quenched superconductivity materials Y1−xPrxBa2Cu3O7−δJournal of the Less Common Metals, 1989
- Photoemission studies of high-Tc superconductor Ba2Y1−xPrxCu3O7+δSolid State Communications, 1989
- Depression of superconductivity, heavy fermion behavior and valence fluctuations in Y1−xPrxBa2Cu3O7Solid State Communications, 1989
- Pressure dependence of the superconducting transition temperature of (Y1−χPrχ)Ba2Cu3O7−δ compounds; Evidence for 4f electron hybridizationPhysica C: Superconductivity and its Applications, 1988
- High-temperature superconductivity in the presence ofholes: A spectroscopic studyPhysical Review B, 1987