Quantum Monte Carlo Simulations on S=1/2 antiferromagnetic-Ferromagnetic Random Alternating spin chain

Peng Zhang; Zhaoxin Xu; Heping Ying; Jianhui Dai

paper

Quantum Monte Carlo Simulations on S=1/2 antiferromagnetic-Ferromagnetic Random Alternating spin chain

arXiv:cond-mat/0502543

Abstract

The S=1/2 Heisenberg chain with bond alternation and randomness of antiferromagnetic (AFM) and ferromagnetic (FM) interactions is investigated by quantum Monte Carlo simulations of loop/cluster algorithm. Our results have shown interesting finite temperature magnetic properties of this model. The relevance of our study to the observed results of the material (CH $_{3}$ ) $_{2}$ CHNH $_{3}$ Cu(Cl $_{x}$ Br $_{1 - x}$ ) $_{3}$ is discussed.

5 pages, 9 figures, paper submit to conference ""Non-Perturbative Quantum Field Theory: Lattice and Beyond", Guangzhou, P.R. China, Nov. 2004