title: Quasielastic neutron scattering in the high-field phase of a Haldane antiferromagnet.
abstract: Inelastic neutron scattering experiments on the Haldane-gap quantum antiferromagnet Ni(C5D14N2)2-N3(PF6) are performed in magnetic fields below and above the critical field H(c) at which the gap closes. Quasielastic neutron scattering is found for H>H(c), indicating topological excitations in the high-field phase.
authors.affiliation: Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
authors.forename: A
authors.initials: A
authors.lastname: Zheludev
authors.forename: Z
authors.initials: Z
authors.lastname: Honda
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: C L
authors.initials: CL
authors.lastname: Broholm
authors.forename: K
authors.initials: K
authors.lastname: Katsumata
authors.forename: S M
authors.initials: SM
authors.lastname: Shapiro