Abstract
Measurements of the conductivity, magnetic susceptibility, and specific heat have been made on single crystals of hexagonal NiS (NiAs structure) of controlled purity and stoichiometry. Above the transition temperature NiS is found to be a metal having a density of states at the Fermi surface of approximately 26.5×1022 states/cm3 eV and displaying only Pauli paramagnetism. Below the transition temperature NiS is found to be a semimetal with a density of carrier states at the Fermi surface roughly half that of the metallic state. Below the transition temperature NiS is an antiferromagnet with a Néel temperature of approximately 1600°K. The data are interpreted and a density of states for hexagonal NiS is presented which is, we believe, in accord with all presently known data. This model resembles in many ways that of White and Mott and attributes the conductivity change to a splitting and narrowing of the Ni(eg) bands below the conductivity transition.
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