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A finite-cell-scaling analysis of the spin-1 antiferromagnetic Heisenberg-Ising chain, shows that the ground-state properties are completely different than in the spin- case. Between the XY gapless phase and the doublet ground-state N\'eel phase, it appears, in an extended range of the anisotropy (01. 18) a characteristic Heisenberg-phase with a nonmagnetic singlet ground state, nonzero gap, and exponential decay of the correlation functions.
Botet et al. (Sat,) studied this question.
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