title: Novel neutron resonance mode in dx2-y2-wave superconductors.
abstract: We show that a new resonant magnetic excitation at incommensurate momenta, observed recently by inelastic neutron scattering experiments on YBa2Cu3O6.85 and YBa2Cu3O6.6, is a spin exciton. Its location in the Brillouin zone and its frequency are determined by the momentum dependence of the particle-hole continuum. We identify several features that distinguish this novel mode from the previous resonance mode observed near Q=(pi,pi).
authors.affiliation: Institut für Theoretische Physik, Freie Universität Berlin, D-14195, Berlin, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Eremin
authors.forename: D K
authors.initials: DK
authors.lastname: Morr
authors.forename: A V
authors.initials: AV
authors.lastname: Chubukov
authors.forename: K H
authors.initials: KH
authors.lastname: Bennemann
authors.forename: M R
authors.initials: MR
authors.lastname: Norman