Eur. Phys. J. B 26, 301-306 (2002)
https://doi.org/10.1140/epjb/e20020093

Dynamic spin-glass behavior in a disorder-free, two-component model of quantum frustrated magnets

¹ Institut de Physique Théorique, Université de Lausanne, 1015 Lausanne, Switzerland
² Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse, France

Corresponding author: ^a frederic.mila@ipt.unil.ch

Received: 21 September 2001
Revised: 16 January 2002
Published online: 15 April 2002

Abstract

Motivated by the observation of a spin-glass transition in almost disorder-free Kagome antiferromagnets, and by the specific form of the effective low-energy model of the S=1/2, trimerized Kagome antiferromagnet, we investigate the possibility to obtain a spin-glass behavior in two-component, disorder-free models. We concentrate on a toy-model, a modified Ashkin-Teller model in a magnetic field that couples only to one species of spins, for which we prove that a dynamic spin-glass behavior occurs. The dynamics of the magnetization is closely related to that of the underlying Ising model in zero field in which spins and pseudo-spins are intimately coupled. The spin-glass like history dependence of the magnetization is a consequence of the ageing of the underlying Ising model.