Field-Induced Disorder Point in Non-Collinear Ising Spin Chains
Résumé
We perform a theoretical study of a non-collinearIsing 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 threehelical 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 magnetizationprocess and discuss the impact of the degeneracy on the dynamical properties by using arguments based on the Glauber dynamics.
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