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.

References in corpus (23)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• A review of Fe-chalcogenide superconductors: the simplest Fe-based superconductor
• Superconductivity at 32 K in single crystal Rb${}_{0.78}$Fe${}_2$Se${}_{1.78}$}
• Theory of magnetic excitations in iron-based layered superconductors
• Magnetism in Fe-based superconductors
• d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Coexistence of 3d-ferromagnetism and superconductivity in [(Li(1-x)Fex)OH](Fe(1-y)Liy)Se
• Electronic Structure and Superconductivity of FeSe-Related Superconductors
• NMR Study in the Iron-Selenide Rb0.74Fe1.6Se2: Determination of the Superconducting Phase as Iron Vacancy-Free Rb0.3Fe2Se2
• Soft chemical control of superconductivity in lithium iron selenide hydroxides Li1-xFex(OH)Fe1-ySe
• Synthesis of a new alkali metal-organic solvent intercalated iron selenide superconductor with Tc{\approx}45K
• Strong $(\pi ,0)$ spin fluctuations in $\beta$-FeSe observed by neutron spectroscopy
• Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and arsenide superconductors
• Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y
• Emergence of Fully-Gapped $s_{++}$-wave and Nodal d-wave States Mediated by Orbital- and Spin-Fluctuations in Ten-Orbital Model for KFe${}_2$Se${}_2$
• Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe
• Spin-wave excitations and superconducting resonant mode in Cs(x)Fe(2-y)Se2

Cited by in corpus (12)

• Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$
• 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
• Probing the superconducting gap structure of (Li${}_{1-x}$Fe${}_x$)OHFeSe
• 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
• 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
• 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