Abstract
Using photoemission (PES) spectroscopy and a first-principles band-structure calculation, we have investigated the electronic structure of perovskite-type Ti-Cr oxides Sr 1 - ( x + y ) La x + y Ti 1 - x Cr x O 3 , in which the charge and spin density can be controlled. It was found that the near-Fermi level ( E F ) electronic structure consisted of a Cr 3d localized state and a Ti 3d itinerant state that were well separated in energy. The spectral weight of the Cr 3d state was proportional to x , demonstrating a controllable spin density. In contrast, the near- E F spectral weight exhibited different behavior. The band theory has reproduced the essential features of the Cr and Ti 3d states as well as the O 2p ones, but failed to predict the location of the Cr 3d and O 2p states. Implications of this discrepancy have been discussed in connection with calculated magnetic moments.
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