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

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

2003-12-19

arxiv.org/abs/cond-mat/0312528v1

Physical Review B 70 (2004) 134423

Physics

Condensed Matter

Materials Science

revtex 4, 10 pages, 7 figures

Scientific paper

10.1103/PhysRevB.70.134423

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.

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