Abstract
Hexagonal lattice parameters a and c of the NiAs-type NiS 1- y Se y expand with increasing y below the solubility limit y L =0.20. The first-order transition temperature T t ( y ) [between the antiferromagnetic less-conductive and the Pauli-paramagnetic high-conductive states] decreases with increasing y , and is suppressed down to liq. He temperature at the critical concentration , y c =0.133. Just above T t ( y ) the temperature slope of the susceptibility has positive sign at low y , and shows a y -dependence. The isothermal susceptibility of the Pauli-paramagnetic state decreases with increasing y . These experimental results are discussed on the basis of the strongly correlated features of d and p bands in NiS.
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