Abstract
X-ray Rietveld analyses for BaCoS 2 under high pressure and magnetic excitation measurements for BaCo 1− x Ni x S 2 at ambient pressure and for BaCoS 2 under high pressure have been carried out. Atomic distances in a CoS 5 pyramid abruptly change in the narrow region around the Mott metal–insulator transition with increasing external pressure ( p). It suggests that the redistribution of electron numbers among the relevant bands occurs together with the p-induced Mott transition. The characteristic energy of the spin fluctuation behaves rather differently in two kinds of metallic phases induced by varying x and p, indicating that the main driving forces of the Mott transitions are different.
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