Abstract
Sandwich-type junctions using a Bi-based oxide barrier were successfully fabricated. Bi2Sr2Ca1Cu2O8+x films were used for superconducting electrodes and Bi2Sr2Nd1Cu2O8+x films were used for the barrier layers. All materials had the same crystalline structure and nearly the same lattice constant with each other. The conductivity of Bi2Sr2Nd1Cu2O8+x films were rather low than ordinary metals or Bi2Sr2Cu1O6+x and its temperature dependence can be explained by the variable range hopping (VRH) model. We observed S/N/S-type Josephson effects in the junctions. Those junctions also exhibited negative resistive behaviors on the I-V curves at higher current biased region. These characteristics were evaluated from a local heating mechanism using VRH model.
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