Influence of cobalt substitution on the magnetism of NiBr${}_2$

Abstract

Co substituted Ni${}_{1-x}$Co${}_x$Br${}_2$ (0 $\le x\le$ 1) single crystals were synthesized using vapor transport. The physical properties of the crystals were characterized by x-ray powder diffraction, magnetization, and specific heat measurements. Room temperature x-ray powder diffraction data indicate a change from the CdCl${}_2$ structure type to the CdI${}_2$ structure type occurs within 0.56 $<x<$ 0.76. NiBr${}_2$ has a commensurate antiferromagnetic phase below $T_{\mathrm{N}}\approx$ 46 K and an incommensurate magnetic ground state below $T_{\mathrm{IC}}\approx$ 20 K. Both magnetic transitions are affected by cobalt substitution, and the incommensurate phase transition is present up to at least $x$ = 0.56. The evolution of magnetism has been studied as a function of cobalt content and is summarized in the temperature-composition phase diagram.

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