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

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arxiv 0811.2154 v3 pith:WC2TTKW3 submitted 2008-11-13 cond-mat.str-el

A. Perucchi , C. Marini , M. Valentini , P. Postorino , R. Sopracase , P. Dore , P. Hansmann , O. Jepsen
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G. Sangiovanni A. Toschi K. Held D. Topwal D. D. Sarma S. Lupi
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classification cond-mat.str-el
keywords pressureinfraredinsulatorlatticemetalse-alloyingtransitionalloying
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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. Measurements performed by applying pressure to pure NiS2 (lattice contraction) and by Se-alloying (lattice expansion) reveal that in both cases an anomalous metallic state is obtained. We find that optical results are not compatible with the linear Se-alloying vs Pressure scaling relation previously established through transport, thus pointing out the substantially different microscopic origin of the two transitions.

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