Pressure Effects on the Mott Metal-Insulator Transitions in BaCo_1-xNi_xS₂

抄録

Electrical resistivity measurements under hydrostatic pressure have been carried out on single crystals of BaCo_1-xNi_xS₂, which has a layered structure and exhibits the Mott metal-insulator transition with varyingx. It has been found that the Mott transition can also be controlled by the external pressure p. Based on the resistivity data, a T-p-x phase diagram has been constructed, and the physical properties near the Mott transition induced by the pressure p are presented.