Cooperative Phenomena in a Quasi-Random Antiferromagnet

Abstract

A simple model of dilute, quasi-random antiferromagnet with local atomic correlation has been presented. The simulation study for Ising spins on this quasi-random lattice has revealed some interesting magnetic properties. Spin-glass-like cusp and anomaly in the linear and nonlinear susceptibilities are observed, while the model exhibits a second-order antiferromagnetic transition. It has been found that the magnetization induced by the external field is much larger than that in the simple random dilute case. It is suggested that the characteristic magnetic properties are originated in the large amplitude of the magnetization fluctuation in the correlated lattice.