Abstrakti
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 TV, it occupies the Fe2+ dxz orbital, which is ordered. Above TV, the electron partially occurs also at the trivalent iron and spreads over two additional orbitals, dx2-y2 and dz2. In the valence-mixing state (above Tp) also orbital dyz 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.
Alkuperäiskieli | Englanti |
---|---|
Sivut | 329–339 |
Julkaisu | Hyperfine Interactions |
Vuosikerta | 226 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 2014 |
OKM-julkaisutyyppi | A1 Julkaistu artikkeli, soviteltu |
Keywords
- 57Fe Mössbauer spectroscopy
- Charge ordering
- Valence mixing
- Mixed valence
- Double perovskites