Synthesis, crystal structure and spin-density-wave anomaly of the iron arsenide-fluoride SrFeAsF

Abstract

The new quaternary iron arsenide-fluoride SrFeAsF with the tetragonal ZrCuSiAs-type structure was synthesized and the crystal structure was determined by X-ray powder diffraction (P4/nmm, a = 399.30(1), c = 895.46(1) pm). SrFeAsF undergoes a structural and magnetic phase transition at 175 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 (P4/nmm) to orthorhombic (Cmme). 57Fe Moessbauer spectroscopy experiments show a single signal at room temperature at an isomer shift of 0.30(1) mm/s and magnetic hyperfine-field splitting below the phase transition temperature. Our results clearly show that SrFeAsF exhibits a spin density wave (SDW) anomaly at 175 K very similar to LaFeAsO, the parent compound of the iron arsenide-oxide superconductors and thus SrFeAsF may serve as a further parent compound for oxygen-free iron arsenide superconductors.

arXiv comment5 pages, 7 figures

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• Competition of magnetism and superconductivity in underdoped (Ba1-xKx)Fe2As2
• New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)
• Superconductivity, magnetism and crystal chemistry of Ba1-xKxFe2As2
• Magnetic order in CaFe1-xCoxAsF (x = 0, 0.06, 0.12) superconductor compounds
• Effect of 3d Transition Metal Doping on the Superconductivity in Quaternary Fluoroarsenide CaFeAsF
• Shape of spin density wave versus temperature in AFe2As2 (A=Ca, Ba, Eu): A Mössbauer study
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• Structure and physical properties of new layered iron oxychalcogenide BaFe2OSe2
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• La-substituted CaFeAsH superconductor with Tc = 47 K
• Two-dimensional magnetism in the pnictide superconductor parent material SrFeAsF probed by muon-spin relaxation
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• Effects of magnetic doping and temperature dependence on phonon dynamics in CaFe\_{1-x}Co\_{x}AsF compounds (x = 0, 0.06, 0.12)
• Coexistence of superconductivity and magnetism in CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ as probed by ${}^{57}$Fe Mössbauer spectroscopy
• Superconductivity and Crystal Structure of the Palladium-Iron-Arsenides Ca10(Fe1-xPdxAs)10Pd3As8
• Structural and magnetic phase transitions in triclinic Ca10(FeAs)10(Pt3As8)
• Probing the Ground State Properties of Iron-based Superconducting Pnictides and Related Systems by Muon-Spin Spectroscopy
• Growth and characterization of CaFe${}_{1-x}$Co${}_x$AsF single crystals by CaAs flux method
• Charge redistribution at the antiferromagnetic phase transition in SrFeAsF compound
• Striped antiferromagnetism and electronic structures of SrFeAsF and their implications
• Antiphase magnetic boundaries in iron-based superconductors: A first-principle density-functional theory study
• Multi-band superconductivity in LaFeAsO_{0.9}F_{0.1} single crystals probed by high-field vortex torque magnetometry
• Effect of antifluorite layer on the magnetic order in Eu-based 1111 compounds, EuTAsF (T = Zn, Mn, and Fe)
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• In-plane electronic anisotropy revealed by interlayer resistivity measurements on the iron-based superconductor parent compound CaFeAsF
• Superconductivity above 30 K due to the introduction of oxygen in CaFeAsF