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

被引：975

作者：

Rotter, Marianne ^{[1
]}

Tegel, Marcus ^{[1
]}

Johrendt, Dirk ^{[1
]}

Schellenberg, Inga ^{[2
]}

Hermes, Wilfried ^{[2
]}

Poettgen, Rainer ^{[2
]}

机构：

[1] Univ Munich, Dept Chem & Biochem, D-81377 Munich, Germany

[2] Univ Munster, Inst Anorgan & Analyt Chem, D-48149 Munster, Germany

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.78.020503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ternary iron arsenide BaFe(2)As(2), with the tetragonal ThCr(2)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. BaFe(2)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)Fe Mossbauer 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 BaFe(2)As(2) can serve as a parent compound for oxygen-free iron arsenide superconductors.

引用

页数：4

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