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The ground-state properties of some finite antiferromagnetic Heisenberg rings with N spins at the isotropic point have been investigated using a modified Lanczos method. Rings with spin 1 and (3/2 have been studied and new results are presented for the correlation functions and the structure factor up to N=16 (12) for S=1 ((3/2). Evidence in support of Haldane's conjecture is found. The correlation functions for S=(3/2 behave as predicted by Affleck.
Adriana Moreo (Mon,) studied this question.
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