Phase Diagrams of S=3/2, 2 XXZ Spin Chains with Bond-Alternation

Abstract

We study the phase diagram of S=3/2 and S=2 bond-alternating spin chains numerically. In previous papers, the phase diagram of S=1 XXZ spin chain with bond-alternation was shown to reflect the hidden $Z_2\times Z_2$ symmetry. But for the higher S Heisenberg spin chain, the successive dimerization transition occurs, and for anisotropic spin chains the phase structure will be more colorful than the S=1 case. Using recently developed methods, we show directly that the phase structure of the anisotropic spin chains relates to the $Z_2\times Z_2$ symmetry.

13 pages, 6 figures(eps), RevTex

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