Li intercalation effects on magnetism in undoped and Co-doped anatase TiO2

The effects of n-type carrier doping by Li intercalation on magnetism in undoped and Co-doped anatase TiO2 are investigated. We have found that doped n-type carriers in TiO2 are localized mainly at Ti sites near the intercalated Li. With increasing the intercalation, local spins are realized at Ti. In the case of Co-doped TiO2, most of the added n-type carriers fill the Co 3d bands and the rest are localized at Ti. Therefore, Co magnetic moment vanishes by Li intercalation to have a nonmagnetic ground state