We present the electronic structure of
Sr_{1-(x+y)}La_{x+y}Ti_{1-x}Cr_{x}O_{3} investigated by high-resolution
photoemission spectroscopy. In the vicinity of Fermi level, it was found that
the electronic structure were composed of a Cr 3d local state with the
t_{2g}^{3} configuration and a Ti 3d itinerant state. The energy levels of
these Cr and Ti 3d states are well interpreted by the difference of the
charge-transfer energy of both ions. The spectral weight of the Cr 3d state is
completely proportional to the spin concentration x irrespective of the carrier
concentration y, indicating that the spin density can be controlled by x as
desired. In contrast, the spectral weight of the Ti 3d state is not
proportional to y, depending on the amount of Cr doping.Comment: 4 pages, 3 figures. Accepted for publication in Phys. Rev. Let
