Relaxation dynamics of disordered Ising model. Two-site cluster approximation

Abstract

Spin relaxation in a site-disordered Ising model within master equation approach is studied. The $\vec{q},\omega$-dependent susceptibility of the model is calculated and investigated. Effects described by the two-site cluster approximation and lost by the mean field approximation are discussed. Comparison of obtained results with dielectric measurements in $Cs(H_{1-x}{D}_x{)}_{2}P{O}_4$ is presented.

arXiv comment16 (small) pages, lplain emtex with fancyhea, twoside; pcx figures