Spin-density-wave anomaly at 140 K in the ternary iron arsenide BaFe 2 As 2

By M. Rotter, M. Tegel, I. Schellenberg, W. Hermes, R. Pottgen, D. Johrendt. 2008

669 citations recorded by the source corpus.

The ternary iron arsenide ${\text{BaFe}}_{2}{\text{As}}_{2}$, with the tetragonal ${\text{ThCr}}_{2}{\text{Si}}_{2}$-type structure, exhibits a spin-density-wave (SDW) anomaly at 140 K, very similar to LaFeAsO, which is the parent compound of the iron arsenide superconductors. ${\text{BaFe}}_{2}{\text{As}}_{2}$ 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 $(Fmmm)$. $^{57}\text{F}\text{e}$ M\"ossbauer 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 ${\text{BaFe}}_{2}{\text{As}}_{2}$ can serve as a parent compound for oxygen-free iron arsenide superconductors.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Strategy and Management

View Paper: https://www.semanticscholar.org/paper/a28e319af025f93047b70cb2bb4dd617987535ed

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In Condensed Matter Physics

In Electronic, Optical and Magnetic Materials

In Strategy and Management

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Citations in the corpus

In-plane electronic anisotropy of underdoped ‘122’ Fe-arsenide superconductors revealed by measurements of detwinned single crystals (2011, background): “These features have been observed in earlier ARPES data on twinned BaFe2As2 (Yi et al 2009, Liu et al 2010, Richard et al 2010) and SrFe2As2 (Hsieh et al 2008).”
Superconductivity in iron compounds (2011, background): “Undoped BaFe2As2 was reported (Rotter et al., 2008b) to have an SDW transition at 140 K, as well as a tetragonalorthorhombic structural distortion at the same temperature.”
Magnetism and charge dynamics in iron pnictides (2010, background): “The sublattice magnetization is concentrated on iron atoms and its arrangement in space is antiferromagnetic in the x direction and ferromagnetic in the y directio”