Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2

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dc.creatorRotter, Marianne
dc.creatorTegel, Marcus
dc.creatorSchellenberg, Inga
dc.creatorHermes, Wilfried
dc.creatorPöttgen, Rainer
dc.creatorJohrendt, Dirk
dc.date2008-05-27
dc.date2008-06-12
dc.date.accessioned2026-07-07T09:48:33Z
dc.date.available2026-07-07T09:48:33Z
dc.descriptionThe ternary iron arsenide BaFe2As2 with the tetragonal ThCr2Si2-type structure exhibits a spin density wave (SDW) anomaly at 140 K, very similar to LaFeAsO, the parent compound of the iron arsenide superconductors. BaFe2As2 is a poor Pauli-paramagnetic metal and undergoes a structural and magnetic phase transition at 140 K, accompanied by strong anomalies in the specific heat, electrical resistance and magnetic susceptibility. In the course of this transition, the space group symmetry changes from tetragonal (I4/mmm) to orthorhombic (Fmmm). 57Fe Moessbauer spectroscopy experiments show a single signal at room temperature and full hyperfine field splitting below the phase transition temperature (5.2 T at 77 K). Our results suggest that BaFe2As2 can serve as a new parent compound for oxygen-free iron arsenide superconductors.
dc.description4 pages, 6 figures, submitted to PRB
dc.identifierhttps://arxiv.org/abs/0805.4021
dc.identifierhttp://arxiv.org/abs/0805.4021
dc.identifierPhys. Rev. B 78, 020503(R) (2008)
dc.identifierdoi:10.1103/PhysRevB.78.020503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/164256
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleSpin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
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