The zero-field parallel and perpendicular susceptibility and the zero-field specific heat of the quantum easy-plane S=1 Heisenberg spin chains are calculated numerically and applied to TMNB, TMNC and CsNiF3. New values of the model parameters are estimated from fitting procedures. As to CsNiF3, the in-plane specific heat, the field-dependent magnetization and the spin-wave dispersion are also evaluated for a given choice of the microscopic parameters (J/kB=20.5 K, A/J=0.425) and compared with measured quantities. An overall agreement with experiment is revealed.
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Campana et al. (1992) studied this question.