Pressure and alloying effects on the metal to insulator transition in NiS2-xSex studied by infrared spectroscopy

Perucchi, A and Marini, C and Valentini, M and Postorino, P and Sopracase, R and Dore, P and Hansmann, P and Jepsen, O and Sangiovanni, G and Toschi, A and Held, K and Topwal, D and Sarma, DD and Lupi, S (2009) Pressure and alloying effects on the metal to insulator transition in NiS2-xSex studied by infrared spectroscopy. In: Physical Review B: Condensed Matter and Materials Physics, 80 (7).

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Abstract

The metal to insulator transition in the charge-transfer NiS2-xSex 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.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	15 Dec 2009 10:38
Last Modified:	19 Sep 2010 05:46
URI:	http://eprints.iisc.ac.in/id/eprint/23474

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