Metal-insulator Crossover Behavior at the Surface of NiS_2

Details Metal-insulator Crossover Behavior at the Surface of NiS_2 Metal-insulator Crossover Behavior at the Surface of NiS_2

2003-08-11

arxiv.org/abs/cond-mat/0308204v1

Phys. Rev. B 67, 155112 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 3 figures

Scientific paper

10.1103/PhysRevB.67.155112

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 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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