Abstract
We report on the electrical and magnetic properties of the layered ternary sulfide system BaCo 1-x Ni x S 2-y . Ni doped samples of BaCoS 2 that contain sulfur vacancies exhibit a first-order phase transition from a high temperature antiferromagnetic, semiconducting phase to a low temperature metallic phase. Increasing the sulfur vacancy concentration increases the Neel temperature of the two-dimensional antiferromagnetic phase and decreases the resistivity in the metallic phase. As the Ni content is increased, the system undergoes a smooth transition to a paramagnetic metal at all temperatures
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