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Spin resonance in the superconducting state of Li 1 − x Fe x ODFe 1 − y Se observed by neutron spectroscopy

DOI: 10.1103/PhysRevB.94.144503 DOI Help

Authors: N. R. Davies (Department of Physics, University of Oxford) , M. C. Rahn (University of Oxford) , H. C. Walker (ISIS) , R. A. Ewings (ISIS) , D. N. Woodruff (University of Oxford) , S. J. Clarke (University of Oxford) , A. T. Boothroyd (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 94

State: Published (Approved)
Published: October 2016
Diamond Proposal Number(s): 13284

Abstract: We have performed inelastic neutron-scattering measurements on a powder sample of the superconductor lithium iron selenide hydroxide Li 1−x Fe x ODFe 1−y Se(x≃0.16,y≃0.02,T c =41K) . The spectrum shows an enhanced intensity below T c over an energy range of 0.64×2Δ<E<2Δ , where Δ is the superconducting gap, and has maxima at the wave vectors Q 1 ≃1.46 and Q 2 ≃1.97Å −1 . The behavior of this feature is consistent with the spin-resonance mode found in other unconventional superconductors, and in particular strongly resembles the spin resonance observed in the spectrum of another molecular-intercalated iron selenide Li 0.6 (ND 2 ) 0.2 (ND 3 ) 0.8 Fe 2 Se 2 . The signal can be described with a characteristic two-dimensional wave-vector (π,0.67π) in the Brillouin zone of the iron square lattice, consistent with the nesting vector between electron Fermi sheets.

Subject Areas: Materials, Physics

Instruments: I11-High Resolution Powder Diffraction