Physical properties of a quasi-1D Ising S = 1/2 spin system: Ba4CoPt2O9+Δ0

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:508

Article

Sakly, N.¹  Caignaert, V¹  Perez, O.¹  Herve, L.¹  Raveau, B.¹  Hardy, V¹ 

[1] Normandie Univ, CRISMAT, CNRS, UNICAEN,ENSICAEN, F-14000 Caen, France

关键词: Spin chains;    Ising magnetism;   

DOI  :  10.1016/j.jmmm.2020.166877

来源: Elsevier

【 摘 要 】

The spin chain oxide Ba4CoPt2O9+Delta gathers several features that make it close to a 1D Ising S= 1/2 system: (i) it contains only one type of spins, which are associated to a Kramers doublet with a substantial gap from the first excited state; (ii) these spins exhibit a pronounced uniaxial anisotropy; (iii) their easy-axis is perfectly oriented along the spin chain direction; (iv) the spin chains remain uncoupled down to at least 2 K. It is reported that the magnetic susceptibility, the isothermal magnetization and the specific heat in fields up to 9 T can be well accounted for by the theoretical predictions for 1D Ising S= 1/2 systems, yielding consistent set of values for the Lande factors and the intrachain coupling. The presence of missing spins associated to the oxygen over-stoichiometry is taken into account, as well as the polycrystalline nature of the samples which requires to consider angular averages of the anisotropic physical properties.

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