Electronic structure ofSrRu1−xMnxO3studied by photoemission and x-ray absorption spectroscopy

Abstract

In order to investigate the change in the electronic structure with Mn doping of ${\text{SrRu}}_{1\ensuremath{-}x}{\text{Mn}}_{x}{\text{O}}_{3}$ (SRMO), we have performed soft x-ray synchrotron photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). In the soft x-ray PES spectra, the sharp peak structure near the Fermi level $({E}_{\text{F}})$, which was clearly observed in ${\text{SrRuO}}_{3}$, was suppressed accompanied with Mn doping in SRMO. In the $\text{Mn}\text{ }2p$ XAS and $\text{Mn}\text{ }2p\text{\ensuremath{-}}3d$ resonant PES spectra, we have confirmed the existence of ${\text{Mn}}^{3+}$ ions with the electron doping to $\text{Mn}\text{ }3d\text{ }{e}_{g}$ states and $\text{Mn}\text{ }3d$ partial density of state never have finite intensity at ${E}_{\text{F}}$ in SRMO. These results suggest that the metal-insulator transition of SRMO with Mn doping is originated from the charge transfer from the itinerant $\text{Ru}\text{ }4d\text{ }{t}_{2g}$ bands to the localized $\text{Mn}\text{ }3d\text{ }{e}_{g}$ orbitals.