Abstract
We have investigated spin-doping effects on the valence-band electronic structure of Sr 1−( x+ y) La x+ y Ti 1− x Cr x O 3 at y = 0.2 using high-resolution photoemission spectroscopy and first-principles band structure calculations. The Cr 3d photoemission spectral weight located between 2.0 and 3.5 eV increased with x, indicating that x works as a rough measure of the spin density. However, the increase in the spectral weight was actually more rapid than the band theory prediction. The near-Fermi level ( E F) weight due to the Ti 3d states showed significant reduction with x. Considering that the band theory predicted nearly constant density of states near E F, this reduction of the near- E F weight should be interpreted as a manifestation of strong Ti–Cr site disorder effects.
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