Volume 59, Number 1, July 2002
|Page(s)||135 - 141|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 June 2002|
Doped holes in edge-shared chains and the dynamic spectral weight transfer in X-ray absorption spectroscopy
Institut für Festkörper- und Werkstofforschung D-01171 Dresden,
PF 270116, Germany
2 Laboratorium für Festkörperphysik, ETH Zürich - CH-8057 Zürich, Switzerland
3 Institut für Experimentalphysik, Freie Universität Berlin Arnimallee 14, D-14195 Berlin-Dahlem, Germany
4 BESSY GmbH - Albert-Einsteinstr. 15, D-12489 Berlin, Germany
Corresponding author: email@example.com
Accepted: 2 April 2002
We present a joint experimental and theoretical study of the electronic structure of the chain compounds ACuO2 () using O-K and Cu-L3 X-ray absorption spectroscopy. The doping-dependent behaviour in these systems differs from that of conventional 2D Cu-O networks formed by corner-shared CuO4 plaquettes. It follows from the strongly weakened inter-plaquette hybridisation due to the nearly 90° Cu-O-Cu bond in the chains. Spectroscopically, this results in a) the different final states in the Cu-L3 spectra which can be used directly to “read-off” the Cu valency and b) a drastic reduction in the dynamic spectral weight transfer from the upper Hubbard band to the low-energy scale in the O-K spectra.
PACS: 78.70.Dm – X-ray absorption spectra / 71.27+a – Strongly correlated electron systems; heavy fermions / 71.10-w – Theories and models of many-electron systems
© EDP Sciences, 2002
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