Resonant 2p → 3d Photoemission Measurement of MPS_3 (M=Mn,Fe,Ni)"

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Resonant 2p -* 3d photoeznission (RPE) spectra in the valence band region of' the transition-rnetal thiophosphates MPS3 (M ::: Mn, Fe, Ni) have been t'rreasured by trsing syzachrotron ra-diation. These spectra shoxv largely enhanced resonated profiles azad spread over in the widerange (x15 eV) at the incident photon energy of the transition-metal 2p37) ;rbsorption peak,Comparing the obtained spectra with the restrlt of the cluster calculation of RPE spectra Fortransition-naetal monoxides carried out by Tanaka and Jo, we argued the differences of the twopararneters, charge transfer energy A and d-d Coulomb interaction energy Uaa of these materials.It is suggested that lVInPS3 and FePS3 are Nlott-Htrbbard type insulator with A >XJj,j?, whileNiPS3 is a charge transfer type insulator with A< U,z,z.
社団法人日本物理学会の論文
1997-02-15