Electronic structure of Sr0.8-y La0.2+y Ti0.8 Cr0.2 O3 studied by photoemission spectroscopy and first-principles band structure calculations

We have investigated electron-doping effects on the electronic structure of Sr0.8-y La0.2+y Ti0.8 Cr0.2 O3 using high-resolution photoemission spectroscopy and first-principles band structure calculations. Photoemission results showed that the Cr3d peak intensity is independent of the carrier concentration (y), while the spectral weight near the Fermi level, composed of the Ti3d states, is proportional to y at a fixed spin concentration. Detailed comparisons between the photoemission spectra and the band structure calculations including magnetic-moment calculations reveal that the large energy separation between the Cr3d states and the Ti3d states plays an important role to control the electric and magnetic properties in this system.