title: Thermal conductivity of quasi-one-dimensional antiferromagnetic spin-chain materials.
abstract: We study heat transport in quasi-one-dimensional spin-chain systems by considering the model of one-dimensional bosonic spin excitations interacting with three-dimensional phonons and impurities in the limit of weak spin-lattice coupling and fast spin excitations. A combined effect of the phonon and impurity scatterings yields the following spin-boson thermal conductivity behavior: kappa(s) proportional to T2 at low, kappa(s) proportional to T-1 at intermediate, and kappa(s)= const at higher temperatures. Our results agree well with the existing experimental data for Sr2CuO3. We predict an unusual dependence on the impurity concentration for a number of observables and propose further experiments.
authors.affiliation: Department of Physics, University of California-Irvine, Irvine, CA 92697, USA.
authors.forename: A V
authors.initials: AV
authors.lastname: Rozhkov
authors.forename: A L
authors.initials: AL
authors.lastname: Chernyshev