Phenomenological Description of Microwave Characteristics of Low-T_c Superconductor by Three-Fluid Model (Special Issue on Basic Properties and Applications of Superconductive Electron Devices)

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概要

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• copyright(c)1997 IEICE許諾番号：07RB0174　http://www.ieice.org/jpn/trans_online/index.htmlIt is shown that a three-fluid model, which was successfully introduced to explain microwave characteristics of high-T_c superconductors phenomenologically, is suit also to explain those of low-T_c superconductors. In this model, the two contributions of a residual normal electron, in addition to a super and a normal electron in the two-fluid model, and of the temperature (T) dependence of momentum relaxation time τ for the two normal electrons are taken into account. Measured results of the T dependence of surface resistance R_s for a Nb film with critical temperature T_c=9.2 K agree very well with an R_s curve calculated using the present model, where a residual surface resistance at T=0K, R_<so>, and the T dependence of τ were determined using the surface reactance at 0 K X_<so>=37.6 mΩ calculated using the BCS theory to fit, a calculated R_s curve with the measured values as a function of T. Furthermore, microwave characteristics predicted from the BCS theory cannot be explained phenomenologically using the conventional two-fluid model. This difficulty can be solved by using an improved two-fluid model, called the two-fluid (τ) model, where the T dependence of τ is taken into account. Finally the frequency dependence of R_s calculated for the Nb film is f^<1.9> for the BCS theory and f^<2.0> for the three-fluid (τ) model on the assumption of the frequency independence of τ.

• 社団法人電子情報通信学会の論文
• 1997-10-25

著者

• KOBAYASHI Yoshio

  the Department of Electrical and Electronics Engineering, Saitama University

• Kobayashi Yoshio

  The Department Of Electrical And Electronic Engineering Saitama University

• Yoshikawa Hiromichi

  Suzuka National College Of Technology

• YOSHIKAWA Hiromichi

  the Department of Electrical and Electronic Engineering, Saitama University

• ONO Seiichiro

  the Department of Electrical and Electronic Engineering, Saitama University

• Ono Seiichiro

  The Department Of Electrical And Electronic Engineering Saitama University

• Yoshikawa Hiromichi

  The Department Of Electrical And Electronic Engineering Saitama University

• 小林 禧夫

  the Department of Electrical and Electronic Systems, Saitama University

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