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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2004

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

Nicolas Regnault

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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Dates et versions

hal-00000977 , version 1 (19-12-2003)

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A. Vindigni, Nicolas Regnault, Thierry Jolicoeur. Field-Induced Disorder Point in Non-Collinear Ising Spin Chains. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2004, 70, pp.134423. ⟨hal-00000977⟩
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