Analysis of the core-level photoemission spectra of the superconducting cuprates: Evidence for a strongly mixed-valent state

Sarma, DD and Ovchinnikov, SG (1990) Analysis of the core-level photoemission spectra of the superconducting cuprates: Evidence for a strongly mixed-valent state. In: Physical Review B, 42 (10). 6817 - 6819.

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Abstract

We analyze the Cu 2p spectra from a large number of cuprate superconductors and related compounds within the cluster approximation including configuration interaction. We show that the spectra exclude all but a narrow strip of allowed values for the charge-transfer energy $(\Delta)$ and the 3d occupancy $(n_d)$. While the spectral features are very different among different compounds, all the compounds for which experimental data are available at the moment have strikingly similar allowed ranges of $\Delta$ and $n_d$. The deduced $n_d$ values unambiguously classify these compounds as strongly mixed valent, making an ionic or near-ionic description highly improbable.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	12 Jul 2007
Last Modified:	25 Jan 2012 09:08
URI:	http://eprints.iisc.ac.in/id/eprint/11532

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