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• W2103843346 abstract "The structural and magnetic phase transitions of the ternary iron arsenides SrFe2As2 and EuFe2As2 were studied by temperature-dependent x-ray powder diffraction and 57Fe Mössbauer spectroscopy. Both compounds crystallize in the tetragonal ThCr2Si2-type structure at room temperature and exhibit displacive structural transitions at 203 K (SrFe2As2) and 190 K (EuFe2As2), respectively, to orthorhombic lattice symmetry in agreement with the group–subgroup relationship between I4/mmm and Fmmm (β-SrRh2As2-type). 57Fe Mössbauer spectroscopy experiments with SrFe2As2 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." @default.
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• W2103843346 date "2008-10-08" @default.
• W2103843346 modified "2023-10-17" @default.
• W2103843346 title "Structural and magnetic phase transitions in the ternary iron arsenides SrFe₂As₂and EuFe₂As₂" @default.
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• W2103843346 doi "https://doi.org/10.1088/0953-8984/20/45/452201" @default.
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