Spin resonance in the superconducting state of Li1−xFexODFe1−ySe observed by neutron spectroscopy
N. R. Davies, M. C. Rahn, H. C. Walker, R. A. Ewings, D. N. Woodruff, S. J. Clarke, A. T. Boothroyd
DOI 10.1103/PhysRevB.94.144503 · Physical Review B
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Abstract
We have performed inelastic neutron-scattering measurements on a powder sample of the superconductor lithium iron selenide hydroxide Li1−xFexODFe1−ySe(x≃0.16,y≃0.02,Tc=41K). The spectrum shows an enhanced intensity below Tc over an energy range of 0.64×2Δ<E<2Δ, where Δ is the superconducting gap, and has maxima at the wave vectors Q1≃1.46 and Q2≃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 Li0.6(ND2)0.2(ND3)0.8Fe2Se2. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Li1-xFexODFe1-ySe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41 | Pressure not reported | onset |
| Li1-xFexODFe1-ySe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41 | Pressure not reported | onset |
| Li0.84Fe0.16ODFe0.99Se Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41 | Pressure not reported | onset |
| Li0.83Fe0.17ODFe0.97Se Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
| Li0.6(ND2)0.2(ND3)0.8Fe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41 | Pressure not reported | unknown |
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