Electronic structure of pyrite-type MnTe2 studied by photoelectron spectroscopy

The electronic structure of pyrite-type MnTe2 has been investigated by phot oemission spectroscopy. The Mn 3d partial density of states was obtained fr om resonance photoemission experiments in the Mn 3p-->3d core excitation re gion. The experimental results were compared with a linear-muffin;tin-orbit al atomic-sphere approximation ab initio calculation, and some discrepancy was found. To reveal a role of electron correlation, the results were analy zed in terms of the configuration-interaction model by considering a (MnTe6 )(10-) cluster, and parameter values for a model Hamiltonian were estimated (U=5.5 eV, Delta = 1.5 eV and T = 1.4 eV). X-ray photoemission spectra of the Mn 2p core level were also measured to confirm this assignment. [S0163- 1829(98)05227-8].