Spin resonance in the superconducting state of Li${}_{1-x}$Fe${}_x$ODFe${}_{1-y}$Se observed by neutron spectroscopy

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 ($x\simeq 0.16,y\simeq 0.02$, $T_{\mathrm{c}}=41$\,K). The spectrum shows an enhanced intensity below $T_{\mathrm{c}}$ over an energy range $0.64\times 2\Delta <E<2\Delta$, where $\Delta$ is the superconducting gap, with maxima at the wave vectors $Q_1\simeq 1.46$\,Å${}^{-1}$ and $Q_2\simeq 1.97$\,Å${}^{-1}$. The behavior of this feature is consistent with the spin resonance mode found in other unconventional superconductors, and strongly resembles the spin resonance observed in the spectrum of the 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 $(\pi ,0.67\pi )$ in the Brillouin zone of the iron square lattice, consistent with the nesting vector between electron Fermi sheets.

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Cited by in corpus (20)

• Experimental Demonstration of the Sign Reversal of the Order Parameter in (Li1-xFex)OHFe1-yZnySe
• Reemergence of high-Tc superconductivity in the (Li1-xFex)OHFe1-ySe under high pressure
• Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$
• Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
• Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
• Low-energy spin excitations in Li(0.8)Fe(0.2)ODFeSe superconductor studied with inelastic neutron scattering
• Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor Li_{1-x}Fe_{x}(OH)Fe_{1-y}Se
• Probing the superconducting gap structure of (Li${}_{1-x}$Fe${}_x$)OHFeSe
• Possible spin excitation structure in monolayer FeSe grown on SrTiO${}_3$
• Spin Resonances in Iron-Selenide High-Tc Superconductors by Proximity to Hidden Spin Density Wave
• Possible pairing symmetry in the FeSe-based superconductors determined by quasiparticle interference
• Fermi surface pockets in electron-doped iron superconductor by Lifshitz transition
• Isotropic Cooper Pairs with Emergent Sign Changes in Single-Layer Iron Superconductor
• Long range magnetic order in hydroxide layer doped (Li${}_{1-x-y}$Fe${}_x$Mn${}_y$OD)FeSe
• In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands
• Nodeless multigap superconductivity in organic-ion-intercalated (tetrabutyl~ammonium)${}_{0.3}$FeSe
• Particle-Hole Transformation in Strongly-Doped Iron-Based Superconductors
• Spin correlations in the parent phase of Li${}_{1-x}$Fe${}_x$ODFeSe
• Polarized neutron scattering studies of magnetic excitations in iron-selenide superconductor (Li${}_{0.8}$Fe${}_{0.2}$)ODFeSe ($T_c$ = 41 K)
• Quantum-Critical Spin-Density Waves in Iron-Selenide High-Tc Superconductors