Iron orbital occupancies upon valence mixing of charge-ordered GdBaFeIIFeIIIO5 |
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Authors: | J. Lindén F. Lindroos P. Karen |
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Affiliation: | 1. Physics Department, ?bo Akademi University, 20500, Turku, Finland 2. Department of Chemistry, University of Oslo, 0315, Oslo, Norway
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Abstract: | Mössbauer spectra of charge-ordered/valence-mixed GdBaFe2O5 have been analyzed in order to determine the orbital occupancies of the minority-spin d electron as a function of temperature. In the charge-ordered state below the Verwey temperature T V, it occupies the Fe2+ d xz orbital, which is ordered. Above T V, the electron partially occurs also at the trivalent iron and spreads over two additional orbitals, $d_{x^{2}-y^{2}}$ and $d_{z^{2}}$ . In the valence-mixing state (above T p) also orbital d yz participates. The study illustrates how the Mössbauer electric-field gradient, center shift and internal field jointly reflect the distribution of the minority-spin electron culprit behind the Verwey transition. |
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