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THIRD HIGH-CRITICAL TEMPERATURE SUPERCONDUCTORS. APPEARANCE OF BISMUTH AND THALLIUM-BASED OXIDE SUPERCONDUCTORS AND THEIR POTENTIALITY FOR PRACTICAL APPLICATION.

[In Japanese. / En japonais.]

Author(s) : TOGANO K., MAEDA H.

Type of article: Article

Summary

NEW HIGH-CRITICAL TEMPERATURE OXIDE COMPOUNDS WERE DISCOVERED IN BI-SR-CA-CU-O (BSCCO) AND TL-BA-CA-CU-O (TBCCO) SYSTEMS. THE STOECHIOMETRIC COMPOSITION OF THEIR HIGH CRITICAL TEMPERATURE PHASE WAS FOUND TO BE BI(2)SR(2)CA(2)CU(3)O(X) A TL(2)BA(2)CA(2)CU(3)O(X). THE UPPER CRITICAL FIELD (T =0 K), EVALUATED FOR BULK SPECIMENS AND DEFINED AT THE MIDPOINT OF THE RESISTIVE TRANSITIONS ARE 160 AND 220 T FOR BSCCO AND TBCCO, RESPECTIVELY. HIGH VALUES OF CRITICAL CURRENT DENSITY AT 77 K HAVE BEEN ALREADY OBTAINED FOR SPUTTERED BSCCO AND TBCCO, WHILE, FOR THE BULK SPECIMENS THE CRITICAL CURRENT DENSITY REMAINS LESS THAN 10,000 A/CM2 AT 77 K AND 0 T. THE EFFECT OF EACH OF THE FOUR PARAMETERS WHICH RESTRICT THE CRITICAL CURRENT DENSITY IS DISCUSSED WITH THE EXPERIMENTAL RESULTS OF CRITICAL CURRENT DENSITY AND MAGNETIC MEASUREMENTS.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1990-0048
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 23 - n. 6
  • Publication date: 1988
  • Document available for consultation in the library of the IIR headquarters only.

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