Abstract
We fabricated Sr(Ti 1− x V x )O 3 composition-spread films on SrTiO 3 (100) substrates by using pulsed laser deposition in ultra high vacuum. Sharp metal-insulator (MI) transitions were observed in the case of Sr(Ti 1− x V x )O 3− δ composition-spread films grown on an oxygen deficient SrTiO 3 (STO) buffer/SrTiO 3 (STO) substrate in the restricted composition x=0.5–1.0 while no MI transition was observed in the case of Sr(Ti 1− x V x )O 3− δ below x=0.5. In the insulating phase below the MI transition, non-linear I– V characteristics were observed. To explain the appearance and disappearance of MI transitions in Sr(Ti 1− x V x )O 3− δ two possibilities were considered: (i) strain effect from the substrate and (ii) charge-transfer at the interface between Sr(Ti 1− x V x )O 3− δ and STO.
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