Title :
Step-Edge Josephson Junctions on Multilayered High Temperature Superconducting Thin Film
Author :
Shcherbakova, Olga V. ; Lam, Simon K H ; Pan, Alexey V. ; Fedoseev, Sergey V. ; Dou, Shi X. ; Du, Jia ; Foley, Cathy P.
Author_Institution :
Inst. for Supercond. & Electron. Mater., Univ. of Wollongong, Wollongong, NSW, Australia
fDate :
6/1/2011 12:00:00 AM
Abstract :
Application of Josephson effect in sensors, electronic and metrological devices working at temperature of 77 K requires fabrication of efficient and reproducible high temperature superconducting (HTS) Josephson junctions. In order to enhance the performance of HTS junctions, we introduce multilayered approach to YBCO-based step-edge Josephson junction manufacture. Thin YBCO and multilayered YBCO/NdBCO/YBCO films of a similar thickness ( ~ 210 nm) were grown by a pulsed-laser deposition technique on MgO (100) substrates with artificially created step edge. Large discrepancies of Ic and Rn values were found between these two types of junction. Results of their structural and electrical properties are reported.
Keywords :
Josephson effect; barium compounds; high-temperature superconductors; multilayers; neodymium compounds; pulsed laser deposition; superconducting thin films; yttrium compounds; HTS junction; YBCO; YBCO thin film; YBCO-NdBa2Cu3O7-YBCO; YBCO-based step-edge Josephson junction manufacture; electrical properties; multilayered high temperature superconducting thin film; pulsed laser deposition technique; structural properties; temperature 77 K; Grain boundaries; Josephson junctions; Junctions; Manganese; Surface morphology; Yttrium barium copper oxide; Critical current; Josephson junction; YBCO thin film; microstructure; multilayered structure;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2093852
