Fabrication of Bi-Sr-Ca-Cu-O/Barrier/Bi-Sr-Ca-Cu-O Junction by Treatment with Carbonated Water

Shinichiro KOBA  Moriaki UCHIYA  Akio NAKAO  Satoru HIGO  Iwazo KAWANO  Tetsuya OGUSHI  

IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.8   pp.1231-1235
Publication Date: 1993/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Temperature Superconducting Electronics)
high Tc superconductor,  Bi-Sr-Ca-Cu-O system,  thin films,  sputtering,  three layered Bi-Sr-Ca-Cu-O junction,  I-V characteristics,  

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The barrier-layer was successfully fabricated for a preparation of tunneling junction using high Tc oxidesuperconductor such as Bi-Sr-Ca-Cu-O system. Bi2Sr2Ca2Cu3Ox films were used for both superconducting electrodes and the barrier was mainly Bi2Sr2CaCu2O and the rest that was formed by effects of de-calcium from the first sputtered (2223) film. The reaction of de-calcium occurred immersing it in carbonated water. The change of (2223) phase of BSCCO was confirmed with a comparison of the intensity of X-ray diffraction. The superconductive transition temperature of the junction is different from that of the single film (2223) which had no treatment with carbonated water. Zero-bias-currents through fabricated barrier are observed and the critical currents depend on temperature so far as measured temperature region of 79 K-72 K.