title: Spin thermal conductivity of the haldane chain compound Y(2)BaNiO(5).
abstract: We have measured the thermal conductivity of the spin S=1 chain compound Y(2)BaNiO(5). Analyzing the anisotropy of the thermal transport allows us to identify a definite spin-mediated thermal conductivity kappa(s) along the chain direction. The calculated spin-related energy diffusion constant D(E)(T) shows a broad peak around 120 K. Close to room temperature, D(E)(T) approaches the theoretically predicted high-temperature value, while scattering of spin excitations by magnetic impurities seems to be the major limiting factor of kappa(s) at low temperature.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Kordonis
authors.forename: A V
authors.initials: AV
authors.lastname: Sologubenko
authors.forename: T
authors.initials: T
authors.lastname: Lorenz
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.forename: A
authors.initials: A
authors.lastname: Freimuth