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Volume dependent quasiparticle spectral weight in NiS2−xSex system

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, , Citation C Marini et al 2012 J. Phys.: Conf. Ser. 359 012012 DOI 10.1088/1742-6596/359/1/012012

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1 European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP220, 38043 Grenoble Cedex, France

2 CNR-IOM and and Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro 2, I-00185 Roma, Italy

3 Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Basovizza, Trieste, Italy

4 CNR-SPIN and and Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale Aldo Moro 2, I-00185 Roma, Italy

5 Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India

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1742-6596/359/1/012012

Abstract

We discuss the evolution of Infrared reflectivity at room temperature under various pressures (P) and Se alloying concentration in the strongly correlated NiS2−xSex pyrite. Measurements gave a complete picture of the optical response of the system on approaching the P-induced and Se-induced metallic state. A peculiar non-monotonic (V-shaped) volume dependence was found for the quasiparticle spectral weight of both pure and Se-doped compounds.

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10.1088/1742-6596/359/1/012012