Field-Induced Disorder Point in Non-Collinear Ising Spin Chains

TL;DR

This paper models a non-collinear Ising ferrimagnetic spin chain inspired by a specific compound, revealing a disorder point with high ground state degeneracy and analyzing its effects on magnetization and dynamics.

Contribution

It introduces and solves a Hamiltonian model for a non-collinear Ising spin chain, identifying a disorder point and exploring its implications.

Findings

Presence of a disorder point with ground state degeneracy

Predicted magnetization behavior near the disorder point

Impact of degeneracy on dynamical properties analyzed

Abstract

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.