ELECTRON-CORRELATION EFFECTS ON THE PROPERTIES OF LAXSR1-XTIO3

A theoretical study of the electron-correlation effects on the propert ies of LaxSr1-xTiO3 is presented. Using a single band repulsive Hubbar d model employing the Gutzwiller approximation we study the effect of electron correlations on the effective-mass, band narrowing, plasma fr equency, and spin susceptibility. The doping dependence of these prope rties are found to be qualitatively in agreement with recent experimen tal studies on LaxSr1-xTiO3. We have also proposed a possibility for i nducing superconductivity using the idea of proximity effect. The indu ced superconducting gap in LaxSr1-xTiO3 is predicted to be maximum nea r the half-filling of the Ti 3d band.