Comment on "Ground-state properties of a spin-1 antiferromagnetic chain"

Botet and Jullien Phys. Rev. B 27, 613 (1983) and Botet, Jullien, and Kolb Phys. Rev. B 28, 3914 (1983) performed a finite-size scaling analysis of the spin-1 antiferromagnetic Heisenberg-Ising chain. Their work was criticized by Bonner and M\"uller Phys. Rev. B 29, 5216 (1984) on the grounds that a similar analysis for spin yields misleading results. In the present work, we show that the plane-rotator version of spin-1 chain has some features similar to that obtained by Botet et al. , although, unfortunately, our model can be solved analytically only over a restricted set of the parameters, and thus does not unambiguously confirm their results. The need for further studies is emphasized.