Core-level x-ray photoemission on NiO in the impurity limit
- Altieri, S.
- Tjeng, L.
- Tanaka, A.
- Sawatzky, G.
DOIAbstract
We present a core level X-ray photoelectron spectroscopy study of Ni(x)Mg(1 - x)O crystals with 0.03<x<1. We show that nonlocal effects involving inter-Ni-site fluctuations strongly influence the Ni 2p core-level spectra for higher Ni concentrations including NiO itself. It is only in the very dilute Ni limit that the core-level spectra can be described in terms of an Anderson impurity model which also must include a realistic band structure for the O 2p. Moreover, it is only in this limit that a single-sire model can explain the core-level and valence-band spectra as well as the optical data by using one consistent set of parameter values. These results consolidate the concepts of nonlocal screening and provide a better understanding of th...
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