CONDUCTION MECHANISM IN TRANSITION-METAL OXIDES

Electrical conduction in 3d transition-metal oxide compounds (e.g., Sc -doped SrTiO3) with oxygen vacancy is studied from the theoretical vie wpoint. A conduction mechanism due to the motion of proton tunneling a nd hopping in the double minimum potential between two oxygen ions is proposed in the hole-doped perovskite structure with Ti-site substitut ion by Sc. Furthermore, 3d-2p electronic properties in the proton cond ucting Ti-oxides are discussed in comparison with those in high-T-c su perconducting Cu-oxides.