We studied the superconducting properties of $Sm_1Ba_2Cu_3O_{7-δ}$(SBCO) film on the buffer-deposited Ni substrate.
We made a biaxially textured Ni tape by rolling and heat treatment. The substrate was single crystal-like with its [001] perpendicular to the surface and its [100] axes parallel to the rolling direction. $CeO_2/YSZ/CeO_2$ buffer layers on Ni substrate was deposited by e-beam evaporation and SBCO thin film on buffered Ni was grown by thermal co-evaporation.
The critical temperature of our SBCO thin film was 92K and the critical current density was 0.26MA/㎠ at 77K(self field) in the rolling direction. We measured the critical current density at sample temperature 77K as a applied magnetic field was varied. The critical current densities of SBCO film for various magnetic field was lower than YBCO's but the inclimation of SBCO film was similar to the YBCO's. The magnetoresistance of our SBCO thin film was measured. The activation energy of SBCO thin film was calculated at al low resistance region using the measured magnetoresistance. In a high magnetic field region, the activation energy of SBCO film was different form YBCO's. According to the activation energy analysis, we expect that the pinning mechanism between SBCO and YBCO will be different at the high magnetic field region.
