Thermal Transport and Percolative Transition in the Ag-BPSCCO Composite System

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概要

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• The thermal conductivity of the Ag-BPSCCO composite system is studied in the temperature range from 15 K to 200 K. The percolation threshold value of Ag (f_c) is estimated to be 0.25, which is rather close to the three-dimensional percolation threshold (0.16). The observed values of critical exponents near the percolation threshold, t' (f>f_c) and s' (f<f_c), are 1.08 and 0.63, respectively. The observed value of t' is not consistent with the universal value (t=2) in the metal-insulator mixture. This discrepancy is discussed within the framework of the scaling theory. In the first order approximation, the critical behavior below f_c in the Ag-BPSCCO composite is determined by that in the superconductor-normal conductor composite. The thermal conductivity above f_c is explained by the critical property of the good conductor-bad conductor composite with the finite conductivity ratio.

• 社団法人日本物理学会の論文
• 1995-01-15

著者

• 松川 倫明

  Department Of Materials Science And Technology Iwate University

• OGASAWARA Haruhiko

  Institute for Solid State Physics, University of Tokyo

• Ogasawara H

  Spring-8:(present Address)school Of Physics And Physics Research Division Seoul National Universty

• Ogasawara Haruhiko

  Institute For Solid State Physics University Of Tokyo

• Noto Koshichi

  Faculty of Engineering, Iwate University

• MATSUKAWA Michiaki

  Faculty of Engineering,Iwate University

• Matsukawa Michiaki

  Faculty Of Engineering Iwate University

• Ogasawara Hiromitsu

  Department Of Materials Science And Technology Iwate University

• Ogasawara Hiromitsu

  Faculty Of Engineering Iwate University

• Noto K

  Faculty Of Engineering Iwate University

• Noto K

  Iwate Univ. Morioka

• Noto Koshichi

  Faculty Of Engineering Iwate Univ.

• Tatezaki Fumiaki

  Faculty of Engineering, Iwate University

• Yoshida Katsukuni

  Institute of Atomic Energy, Kyoto University

• Tatezaki Fumiaki

  Faculty Of Engineering Iwate University

• Yoshida Katsukuni

  Institute Of Atomic Energy Kyoto University

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