Abstract
S = 1/2 one-dimensional antiferromagnet KCuGaF6, which has the alternation of both the g-tensor and Dyzaloshinsky-Moriya (DM) vector along the chain, is theoretically expected to show the field-induced spingap. We have measured the longitudinal nuclear spin relaxation rate T1−1 of 19F-NMR and found that it shows the thermal activation type temperature dependence, indicating the existing of the spingap. The field-dependence of the gap is found to be proportional to H2/3. These results are consistent with the theory of Affleck and Oshikawa.
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