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CRITICAL STATE IN HIGH CRITICAL TEMPERATURE SUPERCONDUCTORS: MAGNETIZATION AND CREEP OF THE INTERGRANULAR REGION.

Author(s) : CALZONA V.

Type of article: Article

Summary

THE INTERGRANULAR OR TRANSPORT CURRENTS IN SINTERED YBCO SAMPLES HAVE BEEN ANALYSED USING BOTH ALTERNATING CURRENT MAGNETIZATION FOR SLAB SIZED SAMPLES AND DIRECT CURRENT MAGNETIZATION FOR TUBULAR SAMPLES. THE MAGNETIZATION LOOPS OF THE TRANSPORT REGIME HAVE TO BE SEPARATED FROM THE CONTRIBUTION OF THE GRAINS AND MUST BE PROPERLY NORMALIZED TO OBTAIN MEANINGFUL INFORMATION. THE FIT OF THE MAGNETIZATION IS NOT VERY SENSITIVE TO THE FORM OF THE FIELD DEPENDENCE OF CRITICAL CURRENT DENSITY AND DOES NOT ALLOW ONE TO DISTINGUISH BETWEEN DIFFERENT THEORETICAL MODELS. A MODIFIED ROLLINS METHOD WAS THEREFORE USED TO OBTAIN DIRECT INFORMATION ON THE FIELD AND CURRENT PROFILE INSIDE THE SLAB SAMPLES.

Details

  • Original title: CRITICAL STATE IN HIGH CRITICAL TEMPERATURE SUPERCONDUCTORS: MAGNETIZATION AND CREEP OF THE INTERGRANULAR REGION.
  • Record ID : 1991-1947
  • Languages: English
  • Source: Cryogenics - vol. 30 - n. 7
  • Publication date: 1990

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