Optical study of the metal-nonmetal transition in NiS

Details Optical study of the metal-nonmetal transition in NiS Optical study of the metal-nonmetal transition in NiS

1998-11-24

arxiv.org/abs/cond-mat/9811329v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figs, submitted to Solid State Commun. Fig.2 corrected

Scientific paper

10.1016/S0038-1098(99)00277-X

Optical reflectivity study has been made on the hexagonal (NiAs-type) Ni_{1-d}S in order to probe its electronic properties, in particular those associated with the metal-nonmetal transition in this compound. Samples with d=0.005 and 0.02 are studied, which have transition temperatures Tt=246 K and 161 K, respectively. A pronounced dip appears in the reflectivity spectra upon the transition, and the optical conductivity spectra show that the electronic structure below Tt is similar to that of a carrier-doped semiconductor with an energy gap of ~ 0.15 eV. The optical spectra indicate that the gap becomes larger with decreasing temperature, and it becomes smaller as d increases. It is also found that the overall spectrum including the violet region can be described based on a charge-transfer-type semiconductor, consistent with recent photoemission results.

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