Spin-doping effect on the electronic structure of Sr1−(x+y)Lax+yTi1−xCrxO3

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.