Browsing Kjemisk institutt by Author "Lindén, Johan"

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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 / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1999)
    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 ) ...
  • Verwey transition in mixed-valence TbBaFe2O5: Two attempts to order charges 
    Karen, Pavel; Woodward, Patrick M.; Lindén, Johan; Vogt, Tom; Studer, Andrew; Fischer, Peter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2001)
    Electronic, magnetic, and structural phase transitions in nearly stoichiometric TbBaFe 2 O 5 + w ( 0.00 < w < 0.05 ) have been investigated. At high temperatures this compound is a paramagnetic, mixed-valence (Fe 2 . 5 + ...