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NORMAL AND SUPERCONDUCTING PROPERTIES OF THE HIGH CRITICAL TEMPERATURE OXIDES.

Author(s) : KRESIN V. Z., WOLF S. A.

Type of article: Article

Summary

IN THE PRESENT PAPER, AN ANALYSIS OF THE STRUCTURE AND OF THE NORMAL AND SUPERCONDUCTING PROPERTIES (HEATCAPACITY, NORMAL CONDUCTIVITY, THERMAL CONDUCTIVITY, ELECTRON-PHONON COUPLING) OF BOTH LBCO AND YBCO SYSTEMS IS PRESENTED. THESE OXIDES, IN CONTRAST WITH CONVENTIONAL MATERIALS, HAVE A SMALL COHERENCE LENGTH IN COMPARISON WITH THE MEAN FREE PATH OF CHARGED PARTICLES IN THE MATERIAL, SO THAT AVERAGING OF ANISOTROPY IS NOT POSSIBLE AND BCS THEORY IS NO LONGER VALID. THE PRESENT ANALYSIS TAKES INTO ACCOUNT THE ANISOTROPY OF THE CRITICAL FIELD AND GIVES A FORMULATION OF THE PROBLEM IN THE RECIPROCAL SPACE. A < FERMIOLOGY > METHOD IS USED, THAT IS THE FERMI ENERGY, FERMI MOMENTUM, ETC, ARE EXPRESSED IN TERMS OF EXPERIMENTALLY MEASURED QUANTITIES. THE DETERMINED PARAMETERS HAVE REASONABLE VALUES AND THE NEW OXIDES CAN STILL BE UNDERSTOOD IN A < PECULIAR > VERSION OF THE BCS THEORY.

Details

  • Original title: NORMAL AND SUPERCONDUCTING PROPERTIES OF THE HIGH CRITICAL TEMPERATURE OXIDES.
  • Record ID : 1991-0056
  • Languages: English
  • Source: J. sci. ind. Res. - vol. 48 - n. 12
  • Publication date: 1989
  • Document available for consultation in the library of the IIR headquarters only.

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