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SIZE EFFECT ON THE THERMAL CONDUCTIVITY OF HIGH-CRITICAL TEMPERATURE THIN-FILM SUPERCONDUCTORS.

Author(s) : FLIK M. I., TIEN C. L.

Type of article: Article

Summary

USING THE KINETIC THEORY APPROXIMATION AND REPORTED DATA THE STUDY SHOWS THAT AT LOW TEMPERATURES, THE PHONON MEAN FREE PATH IN POLYCRYSTALLINE CERAMIC YBCO CAN BEOF THE ORDER OF THE THICKNESS OF THIN-FILM SUPERCONDUCTORS. IN THIS CASE, BOUNDARY SCATTERING REDUCES THE THERMAL CONDUCTIVITY WITH DECREASING FILM THICKNESS. A SIMPLE METHOD ACCOUNTS FOR THE SIZE EFFECT ON CONDUCTION IN THIN FILMS. THISANALYSIS RESTS SOLELY ON GEOMETRIC ARGUMENTS AND DOES NOT CONSIDER THE EFFECT OF GRAIN BOUNDARIES. FOR CONDUCTION ALONG THE FILM, THIS MODEL APPROXIMATES WELL AN ANALYTICAL SOLUTION OF THE BOLTZ-MANN TRANSPORT EQUATION, AND IS IN GOOD AGREEMENT WITH EXPERIMENTAL DATA.

Details

  • Original title: SIZE EFFECT ON THE THERMAL CONDUCTIVITY OF HIGH-CRITICAL TEMPERATURE THIN-FILM SUPERCONDUCTORS.
  • Record ID : 1991-2411
  • Languages: English
  • Source: J. Heat Transf. - vol. 112 - n. 4
  • Publication date: 1990
  • Document available for consultation in the library of the IIR headquarters only.

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