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Valence State Mixing and Separation in SmBaFe<SUB>2</SUB>O<SUB>5+w</SUB>

Lindén, Johan; Karen, Pavel; Kjekshus, Arne; Miettinen, J.; Pietari, T.; Karppinen, Maarit
Journal article; PublishedVersion; Peer reviewed
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1999+mixingandseparation.pdf (249.8Kb)
Year
1999
Permanent link
http://urn.nb.no/URN:NBN:no-62219

CRIStin
447377

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  • Kjemisk institutt [843]
  • CRIStin høstingsarkiv [15868]
Original version
Physical Review B. Condensed Matter and Materials Physics. 1999, 60 (22), 15251-15260, DOI: http://dx.doi.org/10.1103/PhysRevB.60.15251
Abstract
A mixed-valence state, formally denoted as Fe 2 . 5 + , is observed in the 300 K Mössbauer spectra of the most reduced samples of SmBaFe 2 O 5 + w . Upon cooling below the Verwey-type transition temperature (TV≈ 200 K ) , the component assigned to Fe 2 . 5 + separates into a high-spin Fe 3 + state and an Fe 2 + state with an unusually low internal field. The separation of the mixed-valence state at TV is also confirmed by magnetic susceptibility measurements and differential scanning calorimetry. A model is proposed which accounts for the variation of the amount of the mixed-valence state with the oxygen content parameter w.

© 1999 American Physical Society
 
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