Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting K0.85Fe1.54Se2 (TN=280 K)

Abstract

We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic (AFM) order in semiconducting K${}_{0.85}$Fe${}_{1.54}$Se${}_2$ ($T_N$=$280$ K). We show that the spin wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic in-plane couplings at $T$= $5$ K. At high temperature ($T$= $300$ K) above $T_N$, short range magnetic correlation with anisotropic correlation lengths are observed. Our results suggest that, despite the dramatic difference in the Fermi surface topology, the in-plane anisotropic magnetic couplings are a fundamental property of the iron based compounds; this implies that their antiferromagnetism may originate from local strong correlation effects rather than weak coupling Fermi surface nesting.

arXiv comment5 pages, 4 figures

References in corpus (31)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Interface-induced superconductivity and strain-dependent spin density wave in FeSe/SrTiO3 thin films
• Theory of Electron Nematic Order in LaOFeAs
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• Spin Waves and Magnetic Exchange Interactions in CaFe2As2
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• Bi-collinear antiferromagnetic order in the tetragonal $\alpha$-FeTe
• Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides
• Distinct Fermi Surface Topology and Nodeless Superconducting Gap in (Tl0.58Rb0.42)Fe1.72Se2 Superconductor
• Nematic spin fluid in the tetragonal phase of BaFe2As2
• Low energy spin waves and magnetic interactions in SrFe${}_2$As${}_2$
• Itinerant magnetic excitations in antiferromagnetic CaFe2As2
• Anisotropic itinerant magnetism and spin fluctuations in BaFe2As2: A neutron scattering study
• Electronic identification of the actual parental phase of KxFe2-ySe2 superconductor and its intrinsic mesoscopic phase separation
• Consistent model of magnetism in ferropnictides
• Chalcogen-height dependent magnetic interactions and magnetic order switching in FeSe${}_x$Te${}_{1-x}$
• Anisotropy, Itineracy, and Magnetic Frustration in High-Tc Iron Pnictides
• Electronic structures and magnetic orders of Fe-vacancies ordered ternary iron selenides TlFe${}_{1.5}$Se${}_2$ and AFe${}_{1.5}$Se${}_2$ (A=K, Rb, or Cs)
• Anisotropic three-dimensional magnetism in CaFe2As2
• Paramagnetic Spin Correlations in CaFe2As2 Single Crystals
• The magnetic excitation spectra in BaFe${}_2$As${}_2$: a two-particle approach within DFT+DMFT
• Neutron-Diffraction Measurements of an Antiferromagnetic Semiconducting Phase in the Vicinity of the High-Temperature Superconducting State of K${}_x$Fe${}_{2-y}$Se${}_2$
• Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering
• Finite temperature spin-dynamics and phase transitions in spin-orbital models
• Spin and Charge Dynamics Ruled by Antiferromagnetic Order in Iron Pnictides
• Self-consistent spin-wave theory for a frustrated Heisenberg model with biquadratic exchange in the columnar phase and its application to iron pnictides
• Spin-waves in the $J_{1a}-J_{1b}-J_2$ orthorombic square-lattice Heisenberg models: Application to the iron pnictide materials
• Spin Dynamics of a $J_1-J_2$ Antiferromagnet and its Implications for Iron Pnictides

Cited by in corpus (9)

• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Evidence for a spinon Fermi surface in a triangular lattice quantum spin liquid candidate
• Spin waves and magnetic exchange interactions in the spin ladder compound RbFe${}_2$Se${}_3$
• Soft striped magnetic fluctuations competing with superconductivity in Fe_{1+x}Te
• Strong ferromagnetic exchange interaction in the parent state of the superconductivity in BaFe${}_2$S${}_3$
• Giant biquadratic interaction induced magnetic anisotropy in the iron-based superconductor AxFe2-ySe2
• Origin of doping-induced suppression and reemergence of magnetism in LaFeAsO${}_{1-x}$H${}_x$
• Mott localization in a pure stripe antiferromagnet Rb${}_{1-\delta }$Fe${}_{1.5-\sigma }$S${}_2$
• Spin Waves and Spatially Anisotropic Exchange Interactions in the $\mathrm{S}=2$ Stripe Antiferromagnet Rb${}_{0.8}$Fe${}_{1.5}$S${}_2$