Abstract
The Mott transition between the metallic and insulating paramagnetic phases of the layer perovskite Ca2 − xSrxRuO4 is analyzed within the Dynamical Mean Field Theory. To simulate the band narrowing caused by finite Ca doping concentrations, quasi-particle spectra appropriate for Sr2RuO4 are evaluated for increasing values of the on-site Coulomb energy U. At small U the planar geometry splits the t2g bands near EF into a wide, two-dimensional dxy band and two narrow, nearly one-dimensional dxz,yz bands. At larger U, however, the spectral distribution of these states exhibits similar correlation features, suggesting a common metal-insulator transition for all t2g bands at the same critical U.