Abstract
Using the configuration-interaction approach, we show that various core-level spectroscopic observations on the high- superconducting oxides can be consistently described in terms of mixing between and configurations, with a negligible amount of the () state. From our analysis of the existing experimental data, we provide evidence of a wide and continuous valence transition in these systems as a function of temperature. The changes in the hybridization strengths deduced here are indicative of structural modifications of the square-planar clusters with decreasing temperature.
- Received 8 January 1988
DOI:https://doi.org/10.1103/PhysRevB.37.7948
©1988 American Physical Society