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  4. Electronic Phase Separation and Dramatic Inverse Band Renormalization in the Mixed-Valence Cuprate LiCu2O2
 
research article

Electronic Phase Separation and Dramatic Inverse Band Renormalization in the Mixed-Valence Cuprate LiCu2O2

Moser, S.  
•
Nomura, Y.
•
Moreschini, L.  
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2017
Physical Review Letters

We measured, by angle-resolved photoemission spectroscopy, the electronic structure of LiCu2O2, a mixed-valence cuprate where planes of Cu(I) (3d(10)) ions are sandwiched between layers containing one-dimensional edge-sharing Cu(II) (3d(9)) chains. We find that the Cu(I)- and Cu(II)-derived electronic states form separate electronic subsystems, in spite of being coupled by bridging O ions. The valence band, of the Cu(I) character, disperses within the charge-transfer gap of the strongly correlated Cu(II) states, displaying an unprecedented 250% broadening of the bandwidth with respect to the predictions of density functional theory. Our observation is at odds with the widely accepted tenet of many-body theory that correlation effects generally yield narrower bands and larger electron masses and suggests that present-day electronic structure techniques provide an intrinsically inappropriate description of ligand-to-d hybridizations in late transition metal oxides.

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Type
research article
DOI
10.1103/PhysRevLett.118.176404
Web of Science ID

WOS:000400241400006

Author(s)
Moser, S.  
Nomura, Y.
Moreschini, L.  
Gatti, G.  
Berger, H.  
Bugnon, P.
Magrez, A.
Jozwiak, C.
Bostwick, A.
Rotenberg, E.
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Date Issued

2017

Publisher

Amer Physical Soc

Published in
Physical Review Letters
Volume

118

Issue

17

Article Number

176404

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSE  
Available on Infoscience
May 30, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/137933
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