title: Low-temperature spin transport in a S = 1 one-dimensional antiferromagnet.
abstract: We study spin transport in the insulating antiferromagnet with S = 1 in one dimension. The spin conductivity is calculated, at zero temperature, using a modified spin wave theory and the Kubo formalism, within the ladder approximation. Two-magnon processes provide the dominant contribution to the spin conductivity. At finite temperature, free magnons are activated, and turn the system into a perfect spin conductor, i.e., the spin conductivity has a Drude form with infinite scattering time.
authors.affiliation: Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, CP 702, 30123-970, Brazil.
authors.forename: A S T
authors.initials: AS
authors.lastname: Pires
authors.forename: L S
authors.initials: LS
authors.lastname: Lima