Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

Abstract

Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wavevectors (1/2 1/2 L) in tetragonal notation. On cooling below TC, a clear resonance peak is observed at this wavevector with an energy of 8.6(0.5) meV, corresponding to 4.5(0.3) kBTC. This is in good agreement with the canonical value of 5 kBTC observed in the cuprates. The spectrum shows strong dispersion in the tetragonal plane but very weak dispersion along the c-axis, indicating that the magnetic fluctuations are two-dimensional in nature. This is in sharp contrast to the anisotropic three dimensional spin excitations seen in the undoped parent compounds.

Include additional data showing dispersion

References in corpus (27)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• The superconductivity at 18 K in LiFeAs system
• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• Two Gaps Make a High Temperature Superconductor?
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• Phase transitions in LaFeAsO: structural, magnetic, elastic, and transport properties, heat capacity and Mossbauer spectra
• Theory of magnetic excitations in iron-based layered superconductors
• Spin resonance in the d-wave superconductor CeCoIn5
• Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron-Pnictide Superconductor BaFe${}_{1.8}$Co${}_{0.2}$As${}_2$
• Spin and Lattice Structure of Single Crystal SrFe2As2
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Low energy spin waves and magnetic interactions in SrFe${}_2$As${}_2$
• Spin susceptibility, phase diagram, and quantum criticality in the electron-doped high Tc Superconductor Ba[Fe(1-x)Co(x)]2As2
• Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
• Anisotropic three-dimensional magnetism in CaFe2As2
• Phonon Density of States of LaFeAsO1-xFx

Cited by in corpus (4)

• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Itinerant magnetic excitations in antiferromagnetic CaFe2As2
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Theory of Raman response in a superconductor with extended s-wave symmetry: Application to Fe-pnictides