Abstract
We have studied the photoemission spectra of perovskite-type and oxides, which have formally the configuration ranging from a Mott insulator to a paramagnetic metal. The results indicate that as the Mott-Hubbard gap closes, spectral weight is transferred from the upper and lower Hubbard bands to the region near the Fermi level with decreasing U/W (U,d-d Coulomb repulsion energy; W, one-electron d-band width), i.e., from the incoherent to the coherent part of the single-particle spectral function.
- Received 18 February 1992
DOI:https://doi.org/10.1103/PhysRevLett.69.1796
©1992 American Physical Society