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Step-Edge Josephson Junctions on Multilayered High Temperature Superconducting Thin Film

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7 Author(s)
Shcherbakova, O.V. ; Inst. for Supercond. & Electron. Mater., Univ. of Wollongong, Wollongong, NSW, Australia ; Lam, S.K.H. ; Pan, A.V. ; Fedoseev, S.V.
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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.

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Applied Superconductivity, IEEE Transactions on  (Volume:21 ,  Issue: 3 )