Josephson Current in Microbridges of YBa 2 Cu 3 O 7-δ Thin Films Prepared by CVD

Single crystallike microbridges are fabricated from YBa 2 Cu 3 O 7-δ thin films made by the CVD method. The thicknesses of the bridges range from 0.2 to 1 µm, and the width and length are both about 1 µm. The critical current densities of the bridges range from 10 4 to 10 5 A/cm 2 at 77 K in zero fi...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1990-01, Vol.29 (1R), p.74
Main Authors: Yamashita, Tsutomu, Era, Masanori, Noge, Satoru, Irie, Akinobu, Yamane, Hisanori, Hirai, Toshio, Kurosawa, Hideyuki, Matsui, Toshiaki
Format: Article
Language:English
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Summary:Single crystallike microbridges are fabricated from YBa 2 Cu 3 O 7-δ thin films made by the CVD method. The thicknesses of the bridges range from 0.2 to 1 µm, and the width and length are both about 1 µm. The critical current densities of the bridges range from 10 4 to 10 5 A/cm 2 at 77 K in zero field. The bridges show clear ac and dc Josephson effects. The single bridges look like typical Josephson junctions, and all transport current in the bridges behaves like Josephson current. However, the temperature dependences of critical current density show J c ∝(1- T / T c ) 3/2. , the bridges behave like one-dimensional long superconductors.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.29.74