X-ray Rietveld analyses for BaCoS2 under high pressure and magnetic excitation measurements for BaCo1-xNixS2 at ambient pressure and for BaCoS2 under high pressure have been carried out. Atomic distances in a CoS5 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.
|Number of pages
|Journal of Physics and Chemistry of Solids
|Published - 1999
|Proceedings of the 1998 7th ISSP International Symposium Frontiers in Neutron Scattering Research (ISSP7) - Tokyo, Jpn
Duration: 1998 Nov 24 → 1998 Nov 27