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Valence-state transition in SrMn 1 − x Mo x O 3 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline…

2009; American Physical Society; Volume: 80; Issue: 20 Linguagem: Inglês

10.1103/physrevb.80.205112

1550-235X

Jieun Lee, Bongjae Kim, B. H. Kim, B. I. Min, S. Koleśnik, O. Chmaissem, J. Mais, B. Dąbrowski, Hyun Joon Shin, D. H. Kim, Hongjoo J. Lee, J.‐S. Kang,

Multiferroics and related materials

The electronic structures of perovskite ${\text{SrMn}}_{1\ensuremath{-}x}{\text{Mo}}_{x}{\text{O}}_{3}$ $(0\ensuremath{\le}x\ensuremath{\le}0.5)$ have been investigated by employing soft x-ray absorption spectroscopy (XAS). $\text{Mn}\text{ }2p$ XAS shows the systematic change in the valence states of Mn ions in ${\text{SrMn}}_{1\ensuremath{-}x}{\text{Mo}}_{x}{\text{O}}_{3}$ due to the substitution of hexavalent ${\text{Mo}}^{6+}(4{d}^{0})$ ions. With increasing $x$, the valence states and the spin configurations of Mn ions change from high-spin (HS) ${\text{Mn}}^{4+}$ for $x=0$, to HS ${\text{Mn}}^{3+}({t}_{2g}^{3}\ensuremath{\uparrow}{e}_{g}^{1}\ensuremath{\uparrow})$ for $x=0.3$, and HS ${\text{Mn}}^{2+}({t}_{2g}^{3}\ensuremath{\uparrow}{e}_{g}^{2}\ensuremath{\uparrow})$ for $x=0.5$. The measured $\text{Mn}\text{ }2p$ XAS spectra are described well with the configuration interaction (CI) cluster model, including the Jahn-Teller distortion effect for ${\text{Mn}}^{3+}$ ions. The combination of the findings of $\text{Mn}\text{ }2p$ XAS and the CI calculations provides the complete picture of the electronic structures of ${\text{SrMn}}_{1\ensuremath{-}x}{\text{Mo}}_{x}{\text{O}}_{3}$ for $0\ensuremath{\le}x\ensuremath{\le}0.5$.