1.
J Phys Condens Matter
; 21(24): 245502, 2009 Jun 17.
Artigo
em Inglês
| MEDLINE
| ID: mdl-21693948
RESUMO
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.