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Author Rotter, Marianne ♦ Tegel, Marcus ♦ Schellenberg, Inga ♦ Hermes, Wilfried ♦ Pöttgen, Rainer ♦ Johrendt, Dirk
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-05-26
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword Condensed Matter - Superconductivity ♦ Condensed Matter - Strongly Correlated Electrons ♦ physics:cond-mat
Abstract The 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.
Description Reference: Phys. Rev. B 78, 020503(R) (2008)
Educational Use Research
Learning Resource Type Article
Page Count 4


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