Static magnetic order of Sr4A2O6Fe2As2(A=Sc and V) revealed by Mössbauer and muon spin relaxation spectroscopies

2010/11/08 by J. Munevar, J. Munévar, D. R. Sanchez +14
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Computer science #Crystal Structures and Properties #Iron-based superconductors research #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.84.024527

4 pages 4 figures: for information, contact [email protected]

arxiv created 2010/11/08 · openalex publication_date 2011/07/22 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Static magnetic order of quasi-two-dimensional FeAs compounds Sr₄A₂O_6\ensuremath-xFe₂As₂, with A= Sc and V, has been detected by ⁵⁷Fe M"ossbauer and muon spin relaxation (\ensuremathμSR) spectroscopies. The nonsuperconducting stoichiometric (x=0) A= Sc system exhibits a static internal/hyperfine magnetic field both at the ⁵⁷Fe and \ensuremathμ⁺ sites, indicating antiferromagnetic order of Fe moments below T_N = 35 K with ~0.1 bohr magneton per Fe at T= 2 K. The superconducting and oxygen deficient (x=0.4) A= V system exhibits a static internal field only at the \ensuremathμ⁺ site below T_N~40 K, indicating static magnetic order of V moments coexisting with superconductivity without freezing of Fe moments. These results suggest that the 42622 FeAs systems belong to the same paradigm with the 1111 and 122 FeAs systems with respect to magnetic behavior of Fe moments.

Citations

• Superconductivity at 25 K in hole-doped (La 1-x Sr x )OFeAs
• The superconductivity at 18 K in LiFeAs system
• The electronic phase diagram of the LaO1−xFxFeAs superconductor
• Superconductivity up to 29 K in SrFe2As2and BaFe2As2at high pressures
• Reduction of Ordered Moment and Néel Temperature of Quasi-One-Dimensional AntiferromagnetsSr2CuO3andCa2CuO3
• Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2