SYSTEMATIC DEVELOPMENT OF THE SPECTRAL-FUNCTION IN THE 3D(1) MOTT-HUBBARD SYSTEM CA1-XSRXVO3

We present an experimental manifestation of how the single-particle density of states around the Fermi level (EF) changes near a Mott transition. In a metallic perovskite-type 3d1 Mott-Hubbard system Ca1-xSrxVO3, as one decreases x the spectral weight of the coherent band near EF is gradually transferred to that of the precursor of the lower Hubbard band ∼2 eV below EF. The momentum dependence of the quasiparticle self-energy and hence the long-range exchange or correlation is shown to become progressively important as one approaches the Mott transition from the metallic side. © 1995 The American Physical Society.