Columnar magnetic structure coupled with orthorhombic distortion in the antiferromagnetic iron arsenide SrFe${}_2$As${}_2$

Abstract

Neutron powder diffraction experiments were carried out on polycrystalline SrFe${}_2$As${}_2$ in order to determine the magnetic structure and its relationship with the crystallographic one. Below $T_0$=205 K, magnetic reflections appear simultaneously with the onset of the orthorhombic distortion. From a detailed Rietveld analysis, the magnetic propagation vector of SrFe${}_2$As${}_2$ is determined to be {\textit{\textbf{q}}}=(1 0 1); the coupling of Fe moments is antiferromagnetic along the longer $a$ direction within the Fe-As layer, and the interlayer coupling is antiferromagnetic as well. The size of the Fe magnetic moment is deduced to be 1.01(3) ${\mu }_{\mathrm{B}}$ with an orientation parallel to the a-axis. The temperature dependence of the magnetic moment shows excellent agreement with not only that of the muon precession frequency but also with that of the structural distortion, revealing the strong coupling of the columnar magnetic order and the structural distortion in SrFe${}_2$As${}_2$.

12 pages, 4 figures

References in corpus (13)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds
• Spin and Lattice Structure of Single Crystal SrFe2As2
• Superconductivity at 53.5 K in GdFeAsO1-delta
• Structural transition and anisotropic properties of single crystalline SrFe2As2
• Strong coupling between magnetic and structural order parameters in SrFe2As2

Cited by in corpus (5)

• Antiferromagnetism of SrFe2As2 studied by Single-Crystal 75As-NMR
• First order magnetic transition in single crystal CaFe${}_2$As${}_2$ detected by ${}^{75}$As NMR
• The superconductor KxSr(1-x)Fe2As2: Normal state and superconducting properties
• Multiorbital Effects on Antiferromagnetism in Fe Pnictides
• Magnetic and lattice coupling in single-crystal SrFe${}_2$As${}_2$: A neutron scattering study