Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2

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dc.creatorTegel, Marcus
dc.creatorRotter, Marianne
dc.creatorWeiss, Veronika
dc.creatorSchappacher, Falko M.
dc.creatorPoettgen, Rainer
dc.creatorJohrendt, Dirk
dc.date2008-06-29
dc.date2008-09-01
dc.date.accessioned2026-07-07T12:24:19Z
dc.date.available2026-07-07T12:24:19Z
dc.descriptionThe structural and magnetic phase transitions of the ternary iron arsenides SrFe2As2 and EuFe2As2 were studied by temperature-dependent x-ray powder diffraction and 57-Fe Moessbauer spectroscopy. Both compounds crystallize in the tetragonal ThCr2Si2-type structure at room temperature and exhibit displacive structural transitions at 203 K (SrFe2As2) or 190 K (EuFe2As2) to orthorhombic lattice symmetry in agreement with the group-subgroup relationship between I4/mmm and Fmmm. 57-Fe Moessbauer spectroscopy experiments with SrFe2 As2 show full hyperfine field splitting below the phase transition temperature (8.91(1) T at 4.2 K). Order parameters were extracted from detailed measurements of the lattice parameters and fitted to a simple power law. We find a relation between the critical exponents and the transition temperatures for AFe2As2 compounds, which shows that the transition of BaFe2As2 is indeed more continuous than the transition of SrFe2As2 but it remains second order even in the latter case.
dc.description11 pages, 6 figures, text revised, one figure amended
dc.identifierhttps://arxiv.org/abs/0806.4782
dc.identifierhttp://arxiv.org/abs/0806.4782
dc.identifierJ. Phys.: Condens. Matter 2008, 20, 452201 (5pp)
dc.identifierdoi:10.1088/0953-8984/20/45/452201
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214288
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleStructural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
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