Abstract
Resonant 2 p →3 d photoemission (RPE) spectra in the valence band region of the transition-metal thiophosphates MPS 3 ( M=Mn, Fe, Ni) have been measured by using synchrotron radiation. These spectra show largely enhanced resonated profiles and spread over in the wide range (∼15 eV) at the incident photon energy of the transition-metal 2 p 3/2 absorption peak. Comparing the obtained spectra with the result of the cluster calculation of RPE spectra for transition-metal monoxides carried out by Tanaka and Jo, we argued the differences of the two parameters, charge transfer energy Δ and d - d Coulomb interaction energy U d d of these materials. It is suggested that MnPS 3 and FePS 3 are Mott-Hubbard type insulator with Δ > U d d , while NiPS 3 is a charge transfer type insulator with Δ < U d d .
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