Spectral weight transfer and mass renormalization in Mott-Hubbard systemsSrVO3andCaVO3: Influence of long-range Coulomb interaction

Abstract

We have studied metallic ${\mathrm{SrVO}}_3$ and ${\mathrm{CaVO}}_3$ by inverse photoemission and high-resolution photoemission. In going from Sr to Ca, considerable spectral weight is transferred from the coherent band to the upper and lower Hubbard bands. Meanwhile, the overall intensity rather than the width of the coherent band decreases, implying that the bandwidth remains finite as the system approaches the Mott transition. The result implies that the effect of long-range Coulomb interaction as well as short-range interaction becomes increasingly important towards the transition.