C-Axis tunneling in multilayers NdBa_2Cu_3O_(7- delta ) junctions with PrBa_2Cu_3O_(7- delta ) barriers

摘要

This work reports, the results on well characterized c-axis quasi-homoepitaxial multilayers made of NdBa_2Cu_3O_(7- delta ) and PrBa_2Cu_3O_(7- delta ) thin films. C-axis tunneling spectroscopy investigations of high quality junctions, fabricated from these NdBa_2Cu_3O_(7- delta)/NdBa_2Cu_3O_(7- delta)/PrBa_2Cu_3O_(7- delta ) multilayers provide evidence of supercurrent and quasiparticle tunneling that is commonly observed for superconductor-insulator-superconductor junctions. We show the importance of using barrier layer materials of PrBa_2Cu_3O_(7- delta ) sandwiched between NdBa_2Cu_3O_(7- delta ) electrodes for the fabrication of electronic devies.