Metal-insulator Crossover Behavior at the Surface of NiS_2

D. D. Sarma, S. R. Krishnakumar, E. Weschke +8

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 in…