We perform a theoretical study of a non-collinear Ising ferrimagnetic spin chain inspired by the compound Co(hfac)2NITPhOMe. The basic building block of its structure contains one Cobalt ion and one organic radical each with a spin 1/2. The exchange interaction is strongly anisotropic and the corresponding axes of anisotropy have a period three helical structure. We introduce and solve a model Hamiltonian for this spin chain. We show that the present compound is very close to a so-called disorder point at which there is a massive ground state degeneracy. We predict the equilibrium magnetization process and discuss the impact of the degeneracy on the dynamical properties by using arguments based on the Glauber dynamics.
@article{arxiv.cond-mat/0312528,
title = {Field-Induced Disorder Point in Non-Collinear Ising Spin Chains},
author = {A Vindigni and N Regnault and Th Jolicoeur},
journal= {arXiv preprint arXiv:cond-mat/0312528},
year = {2009}
}