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CRITICAL CURRENTS AND FLUX CREEP IN MELT PROCESSED HIGH CRITICAL TEMPERATURE OXIDE SUPERCONDUCTORS.

Author(s) : MURAKAMI M.

Type of article: Article

Summary

YBCO CRYSTALS FABRICATED BY A QUENCH AND MELT GROWTH PROCESS CONTAIN FINE Y(2)BACUO(5) PARTICLES. THESE FINE PRECIPITATES ARE CONSIDERED TO HAVE 3 BENEFICIAL EFFECTS: THEY SUPPRESS CRACK FORMATION ; THEY PROMOTE OXYGEN DIFFUSION ; AND THEY ACT AS PINNING CENTRES. BOTH TRANSPORT AND MAGNETIZATION MEASUREMENTS GAVE CRITICAL CURRENT DENSITY VALUES EXCEEDING 30,000 A/CM2 AT 77 K AND 1 T. FLUX CREEP RATE IS ALSO MUCH SMALLER THAN THAT OF SINGLE CRYSTALS AND A VALUE OF PINNING ENERGY COMPARABLE TO THAT OF CONVENTIONAL SUPERCONDUCTORS WAS OBTAINED. A THEORETICAL ESTIMATION OF THE CONTRIBUTION OF 211 PRECIPITATES TO FLUX PINNING IS ALSO PRESENTED.

Details

  • Original title: CRITICAL CURRENTS AND FLUX CREEP IN MELT PROCESSED HIGH CRITICAL TEMPERATURE OXIDE SUPERCONDUCTORS.
  • Record ID : 1991-1948
  • Languages: English
  • Source: Cryogenics - vol. 30 - n. 5
  • Publication date: 1990

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