Abstract
Measurements of the temperature dependence of the chemical shift at Fe nuclei in ${\mathrm{FeS}}_{2}$ (pyrite) and Fe impurities in ${\mathrm{RuS}}_{2}$ (laurite) were performed on high-purity synthetic single-crystal samples using the perturbed-angular-distribution method. Equivalent, considerably negative, and temperature-independent chemical shifts were observed in both hosts, which we attribute to strong van Vleck paramagnetism. Bulk susceptibility data at low temperatures show no local moment formation at Fe sites due to nonstoichiometric sulfur content. The results are evaluated with respect to the photoactive properties of these materials and the requirements for solar-energy applications.
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