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Temperature-Dependent Soft X-ray Photoemission and Absorption Studies of Charge Disproportionation in La<sub>1-<i>x</i></sub>Sr<sub><i>x</i></sub>FeO<sub>3</sub>
We have measured the temperature dependence of the photoemission and x-ray absorption 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 occur below $T_{CD}=190$ K. With decreasing temperature we observed gradual changes of the …