title: Spin waves in the (π,0) magnetically ordered iron chalcogenide Fe1.05Te.
abstract: We use neutron scattering to show that spin waves in the iron chalcogenide Fe(1.05)Te display novel dispersion clearly different from both the first principles density functional calculations and recent observations in the related iron pnictide CaFe(2)As(2). By fitting to a Heisenberg Hamiltonian, we find that although the nearest-neighbor exchange couplings in the two systems are quite different, their next-nearest-neighbor (NNN) couplings are similar. This suggests that superconductivity in the pnictides and chalcogenides share a common magnetic origin that is intimately associated with the NNN magnetic coupling between the irons.
authors.affiliation: The University of Tennessee, Knoxville, Tennessee 37996-1200, USA.
authors.forename: O J
authors.initials: OJ
authors.lastname: Lipscombe
authors.forename: G F
authors.initials: GF
authors.lastname: Chen
authors.forename: Chen
authors.initials: C
authors.lastname: Fang
authors.forename: T G
authors.initials: TG
authors.lastname: Perring
authors.forename: D L
authors.initials: DL
authors.lastname: Abernathy
authors.forename: A D
authors.initials: AD
authors.lastname: Christianson
authors.forename: Takeshi
authors.initials: T
authors.lastname: Egami
authors.forename: Nanlin
authors.initials: N
authors.lastname: Wang
authors.forename: Jiangping
authors.initials: J
authors.lastname: Hu
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Dai