title: Inelastic neutron-scattering measurements of incommensurate magnetic excitations on superconducting LiFeAs single crystals.
abstract: Magnetic correlations in superconducting LiFeAs were studied by elastic and by inelastic neutron-scattering experiments. There is no indication for static magnetic ordering, but inelastic correlations appear at the incommensurate wave vector (0.5±δ,0.5-/+δ,0) with δ~0.07 slightly shifted from the commensurate ordering observed in other FeAs-based compounds. The incommensurate magnetic excitations respond to the opening of the superconducting gap by a transfer of spectral weight.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Köln, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Qureshi
authors.forename: P
authors.initials: P
authors.lastname: Steffens
authors.forename: Y
authors.initials: Y
authors.lastname: Drees
authors.forename: A C
authors.initials: AC
authors.lastname: Komarek
authors.forename: D
authors.initials: D
authors.lastname: Lamago
authors.forename: Y
authors.initials: Y
authors.lastname: Sidis
authors.forename: L
authors.initials: L
authors.lastname: Harnagea
authors.forename: H-J
authors.initials: HJ
authors.lastname: Grafe
authors.forename: S
authors.initials: S
authors.lastname: Wurmehl
authors.forename: B
authors.initials: B
authors.lastname: Büchner
authors.forename: M
authors.initials: M
authors.lastname: Braden