Spin Waves in Random Spin Chains
Disordered Systems and Neural Networks
2009-11-07 v1
Abstract
We study quantum spin-1/2 Heisenberg ferromagnetic chains with dilute, random antiferromagnetic impurity bonds with modified spin-wave theory. By describing thermal excitations in the language of spin waves, we successfully observe a low-temperature Curie susceptibility due to formation of large spin clusters first predicted by the real-space renormalization-group approach, as well as a crossover to a pure ferromagnetic spin chain behavior at intermediate and high temperatures. We compare our results of the modified spin-wave theory to quantum Monte Carlo simulations.
Keywords
Cite
@article{arxiv.cond-mat/0208607,
title = {Spin Waves in Random Spin Chains},
author = {Xin Wan and Kun Yang and Chenggang Zhou and R. N. Bhatt},
journal= {arXiv preprint arXiv:cond-mat/0208607},
year = {2009}
}
Comments
3 pages, 3 eps figures, submitted to the 47th Conference on Magnetism and Magnetic Materials