Valence-state mixing and separation in SmBaFe2O5+w

J. Lindén; P. Karen; A. Kjekshus; J. Miettinen; T.  Pietari; M. Karppinen

doi:10.1103/PhysRevB.60.15251

Valence-state mixing and separation in SmBaFe₂O_5+w

J. Lindén, P. Karen, A. Kjekshus, J. Miettinen, T. Pietari, M. Karppinen

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Abstract

A mixed-valence state, formally denoted as (Formula presented) is observed in the 300 K Mössbauer spectra of the most reduced samples of (Formula presented) Upon cooling below the Verwey-type transition temperature (Formula presented) the component assigned to (Formula presented) separates into a high-spin (Formula presented) state and an (Formula presented) state with an unusually low internal field. The separation of the mixed-valence state at (Formula presented) 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.

Original language	English
Pages (from-to)	15251-15260
Number of pages	10
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	60
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.60.15251
Publication status	Published - 1999
MoE publication type	A1 Journal article-refereed

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10.1103/PhysRevB.60.15251

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title = "Valence-state mixing and separation in SmBaFe2O5+w",

abstract = "A mixed-valence state, formally denoted as (Formula presented) is observed in the 300 K M{\"o}ssbauer spectra of the most reduced samples of (Formula presented) Upon cooling below the Verwey-type transition temperature (Formula presented) the component assigned to (Formula presented) separates into a high-spin (Formula presented) state and an (Formula presented) state with an unusually low internal field. The separation of the mixed-valence state at (Formula presented) 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.",

author = "J. Lind{\'e}n and P. Karen and A. Kjekshus and J. Miettinen and T. Pietari and M. Karppinen",

year = "1999",

doi = "10.1103/PhysRevB.60.15251",

language = "English",

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T1 - Valence-state mixing and separation in SmBaFe2O5+w

AU - Lindén, J.

AU - Karen, P.

AU - Kjekshus, A.

AU - Miettinen, J.

AU - Pietari, T.

AU - Karppinen, M.

PY - 1999

Y1 - 1999

N2 - A mixed-valence state, formally denoted as (Formula presented) is observed in the 300 K Mössbauer spectra of the most reduced samples of (Formula presented) Upon cooling below the Verwey-type transition temperature (Formula presented) the component assigned to (Formula presented) separates into a high-spin (Formula presented) state and an (Formula presented) state with an unusually low internal field. The separation of the mixed-valence state at (Formula presented) 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.

AB - A mixed-valence state, formally denoted as (Formula presented) is observed in the 300 K Mössbauer spectra of the most reduced samples of (Formula presented) Upon cooling below the Verwey-type transition temperature (Formula presented) the component assigned to (Formula presented) separates into a high-spin (Formula presented) state and an (Formula presented) state with an unusually low internal field. The separation of the mixed-valence state at (Formula presented) 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.

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 22

ER -

Valence-state mixing and separation in SmBaFe₂O_5+w

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