NMR relaxation in half-integer antiferromagnetic spin chains
arXiv:cond-mat/9411079 · doi:10.1103/PhysRevB.50.13006
Abstract
Nuclear relaxation in half-integer spin chains at low temperatures (T << J, the antiferromagnetic exchange constant) is dominated by dissipation from a gas of thermally-excited, overdamped, spinons. The universal low temperature dependence of the relaxation rates $1/T_1$ and $1/T_{2G}$ is computed.
7 pages, 1 uuencoded postscript figure appended