Voltar
Artigo Acesso aberto Produção Nacional Revisado por pares
BIBTEX RIS

Magnetization non-rational quasi-plateau and spatially modulated spin order in the model of the single-chain magnet, [{(CuL) 2 Dy}{Mo(CN) 8 }]·2CH 3 CN·H 2 O

2014; Institute of Physics; Volume: 105; Issue: 4 Linguagem: Inglês

10.1209/0295-5075/105/47012

ISSN

1286-4854

Autores

Stefano Bellucci, Vadim Ohanyan, Onofre Rojas,

Tópico(s)

Lanthanide and Transition Metal Complexes

Resumo

Using the exact solution in terms of the generalized classical transfer matrix method we presented a detailed analysis of the magnetic properties and ground state structure of the simplified model of the single-chain magnet, trimetallic coordination polymer compound, [{(CuL)2Dy}{Mo(CN)8}] • 2CH3CN•H2O, in which L 2-is N,N-propylenebis(3-methoxysalicylideneiminato).Due to appearance of highly anisotropic Dy 3+ ion this material is an unique example of the one-dimensional magnets with Ising and Heisenberg bonds, allowing exact statistical-mechanical treatment.We found two zero-temperature ground states corresponding to different part of the magnetization curve of the material.The zero-filed ground state is shown to be an antiferromagnetic configuration with spatial modulation of the local Dy 3+ (which is proven to posses well defined Ising like properties due two large anisotropy of g-factors) and composite S = 1/2 spin of the quantum spin trimer Cu-Mo-Cu in the form "up"-"down"-"down"-"up". Another important feature of this compound is the appearance of the quasi-plateau at non rational value of magnetization due to difference of the gfactors of the Cu-and Mo-ion in quantum spin trimers.The quasi-plateau is an almost horizontal part of the magnetization curve where the corresponding zero-temperature ground state of the chain demonstrate slow but monotonous dependence of the magnetization on the external magnetic field, while the z-projection of the total spin, S z tot is constant.

Referência(s)