Spin fluctuations in LiFeAs observed by neutron scattering

Abstract

We report neutron inelastic scattering measurements on the stoichiometric iron-based superconductor LiFeAs. We find evidence for (i) magnetic scattering consistent with strong antiferromagnetic fluctuations, and (ii) an increase in intensity in the superconducting state at low energies, similar to the resonant magnetic excitation observed in other iron-based superconductors. The results do not support a recent theoretical prediction of spin-triplet p-wave superconductivity in LiFeAs, and instead suggest that the mechanism of superconductivity is similar to that in the other iron-based superconductors.

4 pages, 4 figures

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Cited by in corpus (15)

• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
• Crossover from weak to strong pairing in unconventional superconductors
• Strong $(\pi ,0)$ spin fluctuations in $\beta$-FeSe observed by neutron spectroscopy
• Scanning tunneling spectroscopy of superconducting LiFeAs single crystals: Evidence for two nodeless energy gaps and coupling to a bosonic mode
• Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs
• Transport Properties and Electronic Phase Diagram of Single-Crystalline Ca${}_{10}$(Pt${}_3$As${}_8$) ((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs
• The magnetic moment enigma in Fe-based high temperature superconductors
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
• Anomalous superconducting state in LiFeAs implied by the ${}^{75}$As Knight shift measurement
• Protected Fe valence in quasi-two dimensional $\alpha$-FeSi${}_2$
• Electron-boson spectral density of LiFeAs obtained from optical data
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs