Direct Observation of the Mass Renormalization inSrVO3by Angle Resolved Photoemission Spectroscopy

Abstract

Band dispersions and Fermi surfaces of the three-dimensional Mott-Hubbard system ${\mathrm{SrVO}}_3$ are directly observed by angle-resolved photoemission spectroscopy. An observed spectral weight distribution near the Fermi level ($E_F$) shows cylindrical Fermi surfaces as predicted by band-structure calculations. By comparing the experimental results with calculated surface electronic structures, we conclude that the obtained band dispersion reflects the bulk electronic structure. The enhanced effective electron mass obtained from the energy band near $E_F$ is consistent with the bulk thermodynamic properties and hence with the normal Fermi-liquid behavior of ${\mathrm{SrVO}}_3$.