title: Effect of Fermi surface nesting on resonant spin excitations in Ba(1-x)K(x)Fe2As2.
abstract: We report inelastic neutron scattering measurements of the resonant spin excitations in Ba(1-x)K(x)Fe(2)As(2) over a broad range of electron band filling. The fall in the superconducting transition temperature with hole doping coincides with the magnetic excitations splitting into two incommensurate peaks because of the growing mismatch in the hole and electron Fermi surface volumes, as confirmed by a tight-binding model with s(±)-symmetry pairing. The reduction in Fermi surface nesting is accompanied by a collapse of the resonance binding energy and its spectral weight, caused by the weakening of electron-electron correlations.
authors: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845, USA.
authors: J-P
authors: JP
authors: Castellan
authors: S
authors: S
authors: Rosenkranz
authors: E A
authors: EA
authors: Goremychkin
authors: D Y
authors: DY
authors: Chung
authors: I S
authors: IS
authors: Todorov
authors: M G
authors: MG
authors: Kanatzidis
authors: I
authors: I
authors: Eremin
authors: J
authors: J
authors: Knolle
authors: A V
authors: AV
authors: Chubukov
authors: S
authors: S
authors: Maiti
authors: M R
authors: MR
authors: Norman
authors: F
authors: F
authors: Weber
authors: H
authors: H
authors: Claus
authors: T
authors: T
authors: Guidi
authors: R I
authors: RI
authors: Bewley
authors: R
authors: R
authors: Osborn