High-temperature superconductor Josephson junctions with a gradient Pr-doped Y1−xPrxBa2Cu3O7−δ (x=0.1, 0.3, 0.5) as barriers

• DOI: 10.1063/1.112518
• Publication Date: 2002-07-26T13:39:01Z
• Authors: Q. X. Jia; X. D. Wu; D. Reager; S. R. Foltyn; C. Mombourquette; P. Tiwari; I. H. Campbell; R. J. Houlton; D. E. Peterson
• Keywords: Biasing; Atmospheric temperature range; Liquid nitrogen

High-temperature superconductor YBa2Cu3O7−δ based superconducting-normal-superconducting (SNS) Josephson junctions were fabricated using a unique device design. The normal material included gradient Pr-doped Y1−xPrxBa2Cu3O7−δ layer which was composed of light doping (x=0.1) next to both electrodes, slightly higher (x=0.3) towards the center, and concentration x=0.5 in middle N layer. This design graded lattice mismatch between layer, thus avoiding accumulation all strain at one interface. It also results good chemical, thermal, structural compatibility adjacent layers for desired multilayer structures. SNS this way showed resistively shunted junction current-voltage characteristics under dc bias Shapiro steps microwave irradiation temperature range 75–87 K. Direct current superconducting quantum interference devices voltage modulation about 5 μV by magnetic field liquid nitrogen temperature.