Spin-3/2 random quantum antiferromagnetic chains
无序系统与神经网络
2009-11-10 v1
摘要
We use a modified perturbative renormalization group approach to study the random quantum antiferromagnetic spin-3/2 chain. We find that in the case of rectangular distributions there is a quantum Griffiths phase and we obtain the dynamical critical exponent as a function of disorder. Only in the case of extreme disorder, characterized by a power law distribution of exchange couplings, we find evidence that a random singlet phase could be reached. We discuss the differences between our results and those obtained by other approaches.
引用
@article{arxiv.cond-mat/0308036,
title = {Spin-3/2 random quantum antiferromagnetic chains},
author = {A. Saguia and B. Boechat and M. A. Continentino},
journal= {arXiv preprint arXiv:cond-mat/0308036},
year = {2009}
}
备注
4 pages