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Abstract:
The electronic structure of IrO2 has been investigated using hard x-ray
photoelectron spectroscopy and density-functional theory. Excellent
agreement is observed between theory and experiment. We show that the
electronic structure of IrO2 involves crystal field splitting of the
iridium 5d orbitals in a distorted octahedral field. The behavior of
IrO2 closely follows the theoretical predictions of Goodenough for
conductive rutile-structured oxides [J. B. Goodenough, J. Solid State
Chem. 3, 490 (1971)]. Strong satellites associated with the core lines
are ascribed to final state screening effects. A simple plasmon model
for the satellites applicable to many other metallic oxides appears to
be not valid for IrO2.
