Abstract
The electronic structure of various edge-shared chain compounds A 1-x CuO 2 (A=Ca,Sr,Ba) was studied by 0-K and Cu-L 3 x-ray absorption spectroscopy and exact diagonalizations techniques. The doping-dependent behaviour in these chains differs from that of conventional 2D Cu-O networks of corner-shared CuO 4 plaquettes due to the much smaller inter-plaquette hybridisation. This results in different final states in the Cu-L 3 spectra and a strong reduction in the dynamic spectral weight transfer from the upper Hubbard band to the low energies in the O-K spectra. The spectra can be used to 'read-off' the Cu valency.
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