Perucchi, A., Marini, C., Valentini, M., Postorino, P., Sopracase, R., Dore, P., Hansmann, P., Jepsen, O., Sangiovanni, G., Toschi, A., Held, K., Topwal, D., Sarma, D. D., & Lupi, S. (2009). Pressure and alloying effects on the metal to insulator transition in NiS₂₋ₓSeₓ studied by infrared spectroscopy. Physical Review B, 80(073101). https://doi.org/10.1103/physrevb.80.073101
E138-04 - Forschungsbereich Quantum Materials E138-01 - Forschungsbereich Computational Materials Science E138-02 - Forschungsbereich Correlations: Theory and Experiments
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Journal:
Physical Review B
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ISSN:
2469-9950
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Date (published):
2009
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Number of Pages:
4
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Publisher:
AMER PHYSICAL SOC
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Peer reviewed:
Yes
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Keywords:
Condensed Matter Physics; Electronic, Optical and Magnetic Materials
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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.
