NMR relaxation in half-integer antiferromagnetic spin chains

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

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