Abstract
We study the electronic structure of (Hg1223; ) using photoemission spectroscopy (PES) and -ray absorption spectroscopy (XAS). Resonant valence band PES across the O edge and Cu edge identifies correlation satellites originating in O and Cu two-hole final states, respectively. Analyses using the experimental O and Cu partial density of states show quantitatively different on-site Coulomb energy for the Cu site () and O site (). -cluster calculations with nonlocal screening explain the Cu core level PES and Cu -edge XAS spectra, confirm the and values, and provide evidence for the Zhang-Rice singlet state in Hg1223. In contrast to other hole-doped cuprates and -transition metal oxides, the present results indicate weakly correlated oxygen holes in Hg1223.
- Received 8 December 2016
DOI:https://doi.org/10.1103/PhysRevLett.119.057001
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