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We have measured the temperature dependence of the photoemission and x-rayabsorption spectra of La$_{1-x}$Sr$_x$FeO$_3$ (LSFO) epitaxial thin films with$x=0.67$, where charge disproportionation ($3{Fe}^{3.67+}\to 2{Fe}^{3+}+{Fe}^{5+}$) resulting in long-range spin and charge ordering is known to occurbelow $T_{CD}=190$ K. With decreasing temperature we observed gradual changesof the spectra with spectral weight transfer over a wide energy range of $\sim5$ eV. Above $T_{CD}$ the intensity at the Fermi level ($E_F$) was relativelyhigh compared to that below $T_{CD}$ but still much lower than that inconventional metals. We also found a similar temperature dependence for$x=0.4$, and to a lesser extent for $x=0.2$. These observations suggest that alocal charge disproportionation occurs not only in the $x=0.67$ sample below$T_{CD}$ but also over a wider temperature and composition range in LSFO. Thisimplies that the tendency toward charge disproportionation may be the origin ofthe unusually wide insulating region of the LSFO phase diagram.Comment: 6 pages, 8 figure

journal of the physical society of japan

Temperature-Dependent Soft X-ray Photoemission and Absorption Studies of Charge Disproportionation in La1-xSrxFeO3