Abstract
High quality epitaxial rutile Ti0.95-xFe0.05NbxO2−δ (x = 0, 0.01, 0.02, 0.03) films have been grown on (110) MgF2 substrates by pulsed laser deposition (PLD) method. Detailed experimental characterizations indicate that Nb co-doping in Fe doped TiO2 gives rise to a shrink of the lattice parameter, an increase of electrical resistivity and a variation of magnetic exchange coupling. These results can be explained by the donor and acceptor co-doping effect. It is supposed that Nb, Fe co-doping in rutile will result in defect-dipole clusters which localizes the free electrons, give rise to an increase of resistivity, and transfer the ferromagnetic exchange to antiferromagnetic exchange. These complex interaction between charge carriers and oxygen vacancies may enrich our understanding of doping mechanism in oxide materials and indicate a new way to explore other novel oxide materials.
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