Temperature-dependent soft x-ray photoemission and absorption studies of charge disproportionation in La$_{1-x}$Sr$_x$FeO$_3$

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dc.creatorWadati, H.
dc.creatorChikamatsu, A.
dc.creatorHashimoto, R.
dc.creatorTakizawa, M.
dc.creatorKumigashira, H.
dc.creatorFujimori, A.
dc.creatorOshima, M.
dc.creatorLippmaa, M.
dc.creatorKawasaki, M.
dc.creatorKoinuma, H.
dc.date2004-10-08
dc.date.accessioned2026-07-07T06:28:01Z
dc.date.available2026-07-07T06:28:01Z
dc.descriptionWe 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 spectra with spectral weight transfer over a wide energy range of $\sim 5$ eV. Above $T_{CD}$ the intensity at the Fermi level ($E_F$) was relatively high compared to that below $T_{CD}$ but still much lower than that in conventional 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 a local 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. This implies that the tendency toward charge disproportionation may be the origin of the unusually wide insulating region of the LSFO phase diagram.
dc.description6 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0410202
dc.identifierhttp://arxiv.org/abs/cond-mat/0410202
dc.identifierJ. Phys. Soc. Jpn 75, 054704 (2006)
dc.identifierdoi:10.1143/JPSJ.75.054704
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97591
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleTemperature-dependent soft x-ray photoemission and absorption studies of charge disproportionation in La$_{1-x}$Sr$_x$FeO$_3$
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