An experimental study of nuclear relaxation in the low-temperature antiferromagnetic regime of N-methyl phenazinium tetracyanoquinodimethan (NMP) (TCNQ) is presented. The data are characterized by a relatively weak temperature dependence; the extrapolated zerotemperature rate is finite and of the same magnitude as the rate at TJkB. These results are in good agreement with predictions based on the fermion representation for the spin-{} antiferromagnet in one dimension. The conventional Boson assumption, on the other hand, leads to a predicted rate off by four orders of magnitude in comparison with experiment. The experimental measurements of T₁^-1 thus strongly suggest fermion-like excitations in the spin-{} one-dimensional antiferromagnet.
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Ehrenfreund et al. (1973) studied this question.
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