Abstract
Abstract The effects of substituting Co on the spin-chain compound Sr3Co2O6 with Zn were investigated by synchrotron X-ray diffraction, magnetic susceptibility, isothermal magnetization, and specific heat measurements. To the best of our knowledge, this is the first report to describe the successful substitution of Co in Sr3Co2O6 with Zn. The substitution was carried out by a method involving high pressures and temperatures to obtain Sr3CoZnO6, which crystalized into a K4CdCl6-derived rhombohedral structure with a space group of R-3c, similar to the host compound. With the Zn substitution, the Ising-type magnetic anisotropy of the host compound remarkably reduced; the newly formed Sr3CoZnO6 became magnetically isotropic with Heisenberg-type characteristics. This could probably be ascribed to the establishment of a different interaction pathway, –Co4+(S=1/2)–O–Zn2+(S=0)–O–Co4+(S=1/2)–. Details of the magnetic properties of Zn substituted Sr3Co2O6 were reported.
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