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Numerical Analysis of the Bond-Random Antiferromagnetic S=1 Heisenberg Chain | | Yoshihiro Nishiyama
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28 Oct 1997 | | Journal: | Physica A 252 (1998) 35-47; 258 (1998) 499-500 (E). | | Subject: | cond-mat | | Affiliation: | Okayama University | | Abstract: | Ground state of the bond-random antiferromagnetic S=1 Heisenberg chain with the biquadratic interaction -etasum_i(S_i S_i+1)^2 is investigated by means of the exact-diagonalization method and the finite-size-scaling analysis. It is shown that the Haldane phase etasim0 persists against the randomness; namely, no randomness-driven phase transition is observed until at a point of extremely-broad-bond distribution. We found that in the Haldane phase, the magnetic correlation length is kept hardly changed. These results are contrastive to those of an analytic theory which predicts a second-order phase transition between the Haldane and the random-singlet phases at a certain critical randomness. | | Source: | arXiv, cond-mat/9710276 | | Services: | Forum | Review | PDF | Favorites | |
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