Two-dimensional magnetism in the pnictide superconductor parent material SrFeAsF probed by muon-spin relaxation

Abstract

We report muon-spin relaxation measurements on SrFeAsF, which is the parent compound of a newly discovered iron-arsenic-fluoride based series of superconducting materials. We find that this material has very similar magnetic properties to LaFeAsO, such as separated magnetic and structural transitions (TN = 120 K, Ts = 175 K), contrasting with SrFe2As2 where they are coincident. The muon oscillation frequencies fall away very sharply at TN, which suggests that the magnetic exchange between the layers is weaker than in comparable oxypnictide compounds. This is consistent with our specific heat measurements, which find that the entropy change S = 0.05 J/mol/K largely occurs at the structural transition and there is no anomaly at TN.

4 pages, 3 figures

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Cited by in corpus (12)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Structure, antiferromagnetism and superconductivity of the layered iron arsenide NaFeAs
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• The gradual destruction of magnetism in the superconducting family NaFe(1-x)CoxAs
• Neutron diffraction study on phase transition and thermal expansion of SrFeAsF
• Probing the Ground State Properties of Iron-based Superconducting Pnictides and Related Systems by Muon-Spin Spectroscopy
• Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic (CaFe${}_{1-x}$Pt${}_x$As)${}_{10}$Pt${}_3$As${}_8$
• Charge redistribution at the antiferromagnetic phase transition in SrFeAsF compound
• Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives
• Striped antiferromagnetism and electronic structures of SrFeAsF and their implications
• Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors