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Title: Zhang-Rice physics and anomalous copper states in A-site ordered perovskites
Authors: Freeland, J. W.
Meyers, D.
Mukherjee, Swarnakamal.
Cheng, J. G.
Middey, S.
Zhou, J. S.
Goodenough, J. B.
Gray, B. A.
Saha-Dasgupta, T.
Chakhalian, J.
Keywords: DRNTU::Science::Physics
Issue Date: 2013
Source: Meyers, D., Mukherjee, S., Cheng, J. G., Middey, S., Zhou, J. S., Goodenough, J. B., et al. (2013). Zhang-Rice physics and anomalous copper states in A-site ordered perovskites. Scientific Reports, 3, 1834.
Series/Report no.: Scientific reports
Abstract: In low dimensional cuprates several interesting phenomena, including high Tc superconductivity, are deeply connected to electron correlations on Cu and the presence of the Zhang-Rice (ZR) singlet state. Here, we report on direct spectroscopic observation of the ZR state responsible for the low-energy physical properties in two isostructural A-site ordered cuprate perovskites, CaCu3Co4O12 and CaCu3Cr4O12 as revealed by resonant soft x-ray absorption spectroscopy on the Cu L3,2- and O K-edges. These measurements reveal the signature of Cu in the high-energy 3+ (3d8), the typical 2+ (3d9), as well as features of the ZR singlet state (i.e., 3d9L, L denotes an oxygen hole). First principles GGA + U calculations affirm that the B-site cation controls the degree of Cu-O hybridization and, thus, the Cu valency. These findings introduce another avenue for the study and manipulation of cuprates, bypassing the complexities inherent to conventional chemical doping (i.e. disorder) that hinder the relevant physics.
ISSN: 2045-2322
DOI: 10.1038/srep01834
Rights: © 2013 Nature Publishing Group. This paper was published in Scientific Reports and is made available as an electronic reprint (preprint) with permission of Nature Publishing Group. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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