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The metal to insulator transition in the charge transfer NiS{2-x}Se{x}compound has been investigated through infrared reflectivity. Measurementsperformed by applying pressure to pure NiS2 (lattice contraction) and bySe-alloying (lattice expansion) reveal that in both cases an anomalous metallicstate is obtained. We find that optical results are not compatible with thelinear Se-alloying vs Pressure scaling relation previously established throughtransport, thus pointing out the substantially different microscopic origin ofthe two transitions.

Pressure and alloying effects on the metal to insulator transition in NiS{2-x}Se{x} studied by infrared spectroscopy