  Conversion of spin to charge current was observed in SrTiO3 doped with Nd
(Nd:STO), which exhibited a metallic behavior even with low concentration
doping. The obvious variation of DC voltages for Py/Nd:STO, obtained by
inverting the spin diffusion direction, demonstrated that the detected signals
contained the contribution from the inverse spin Hall effect (ISHE) induced by
the spin dependent scattering from Nd impurities with strong spin-orbit
interaction. The DC voltages of the ISHE for Nd:STO were measured at different
microwave frequency and power, which revealed that spin currents were
successfully injected into doped STO layer by spin pumping. The linear relation
between the ISHE resistivity and the resistivity induced by impurities implied
that the skew scattering was the dominant contribution in this case, and the
spin Hall angle was estimated to be 0.17%. This work demonstrated that
extrinsic spin dependent scattering in oxides can be used in spintroics besides
that in heavy elements doped metals.
