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An even-site block renormalization-group method is applied to the spin-1 and spin- (3/2 anisotropic or alternating Heisenberg antiferromagnets. In the spin-1 case it shows an energy gap 0. 368 166 and ground-state energy E₀/NJ1. 449 724, which are in good agreement with the recent Monte Carlo results. In the spin- (3/2 case it shows an energy excitation behavior similar to that in the spin- (1/2 case. Therefore, our study tends to support Haldane's conjecture. In addition, a possible novel property of the spin-1 Heisenberg antiferromagnet has been predicted.
Pan et al. (Tue,) studied this question.
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