Magnetic phase diagram of the antiferromagnetic cobalt tellurate Co ₃TeO ₆

In this study, we measured the temperature-dependent magnetic susceptibility [χ(T)], ac magnetic susceptibility [χ _ac(T)], specific heat [C _p(T)], and high-field magnetization [M(H)] of a newly synthesized single-crystalline material, Co ₃TeO ₆. Two transitions were observed in χ(T) and C _p(T) curves at values of T _N1 and T _N2 of approximately 26 and 18 K (H=0), respectively. The high-field M(H) curves exhibited strong magnetic anisotropy and several field-induced transitions, suggesting that the magnetic ground state was complicated. Large spin-lattice coupling was evident by the large hysteresis in the M(H) curves and through analysis of the specific heat data. We propose herein an H-T phase diagram that is consistent with our experimental findings.