Electrical transport properties of (110)-oriented PrBa_2(Cu_(0.8)Ga_(0.2))_3O_7thin films

摘要

The electrical transport properties of (110)-oriented PrBa_2(Cu_(0.8)Ga_(0.2))_3O_7 (PBCGO) thin films have been investigated. The electrical resistivity, ρ(T), of (110)-oriented PBCGO thin films is 8.91 × 10~5 Ω-cm at 77 K, about five orders of magnitude higher than that of the (110)-oriented PrBa_2Cu_3O_7 thin films and follows Mott's T~(-1/4) law up to room temperature. Our experimental results suggest filling and localization of holes in Cu-O chains of (110)-oriented PBCGO thin films. We observed very less proximity effect on YBa_2Cu_3O_7 (YBCO)/PBCGO multilayers indicating that the (110)-oriented PBCGO thin films may serve as effective insulators in YBCO SIS tunneling Josephson junction.