Valence states of copper ions and electronic structure of LiCu2O2

• The electronic structure of LiCu2O2 was studied using x-ray emission and photoelectron spectroscopy (valence band and core levels) as well as band-structure calculations in terms of LSDA and LSDA+U approaches. According to the x-ray emission and photoelectron spectra the valence states of the Cu atoms are found to be mixed, i.e. 2+ and 1+.

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