Metal-insulator crossover behavior at the surface ofNiS2
2003
We have performed a detailed high-resolution electron spectroscopic investigation of NiS 2 and related
Se-substituted compounds, NiS 2−x Se x , which are known to be gapped insulators in the bulk
at all temperatures. A large spectral weight at the Fermi energy of the room temperature spectrum, in conjunction with the extreme
surface sensitivity of the experimental probe, however, suggests that the surface layer is metallic at about 300 K. Interestingly, the
evolution of the spectral function with decreasing temperature is characterized by a continuous depletion of the single-particle spectral
weight at the Fermi energy and the development of a gap-like structure below a characteristic temperature, providing evidence for a
metal-insulator crossover behavior at the surfaces of NiS 2 and of related compounds. These results provide a
consistent description of the unusual transport properties observed in these systems.
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