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

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

1997-05-26

arxiv.org/abs/cond-mat/9705263v1

Physics

Condensed Matter

Statistical Mechanics

13 pages, 6 figures(eps), RevTex

Scientific paper

10.1143/JPSJ.66.3379

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.

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