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PERCOLATION AND ELECTRONIC PROPERTIES OF SILVER SUBSTITUTED YBCO SUPERCONDUCTING CERAMICS AND THICK FILMS.

Author(s) : DWIR B.

Type of article: Article

Summary

THE AUTHORS PRESENT THE PERCOLATION AND ELECTRONIC PROPERTIES OF THESE COMPOUNDS IN WHICH SILVER FILLS THE INTERGRANULAR SPACE WITHOUT REDUCING CRITICAL TEMPERATURE, WHICH REMAINS AT 92 K MORE OR LESS 1 K. NORMAL-STATE RESISTIVITY IS DECREASED BY UP TO 2 ORDERS OF MAGNITUDE WHEN ADDING UP TO 50 WT% SILVER (CRITICAL TEMPERATURE = 87 K) AND SAMPLES EXHIBIT IMPROVED CONTACT RESISTANCE, BETTER MECHANICAL PROPERTIES, AND RESISTANCE TO WATER. THEY ANALYZED THE PERCOLATION PROPERTIES OF THESE COMPOUNDS AND FOUND THAT THE CRITICAL INDICES T, S ARE IN AGREEMENT WITH PERCOLATION THEORY, BUT CRITICAL PRESSURE IS HIGHER THAN EXPECTED, PROBABLY DUE TO THE EFFECT OF HOLES. THE CRITICAL CURRENT DENSITY ESTIMATED FROM MAGNETIZATION REACHES 50,000 A/CM2 (AT T = 4.2 K, H = 0) AND SHOWS ENHANCEMENT OF 15-50% BY ADDITION OF ABOUT 10 WT% SILVER, WHICH EXISTS ALSO IN SAMPLES HAVING A HIGHER CRITICAL CURRENT DENSITY DUE TO PREPARATION CONDITIONS (TEMPERATURE).

Details

  • Original title: PERCOLATION AND ELECTRONIC PROPERTIES OF SILVER SUBSTITUTED YBCO SUPERCONDUCTING CERAMICS AND THICK FILMS.
  • Record ID : 1990-2238
  • Languages: English
  • Source: J. Supercond. - vol. 2 - n. 3
  • Publication date: 1989/09
  • Document available for consultation in the library of the IIR headquarters only.

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