Some discussions of an interpretation of surface impedance of low-Tc superconductors by three-fluid model

• YOSHIKAWA Hiromichi

  Faculty of Engineering, Saitama University

• ONO Seiichiro

  Faculty of Engineering, Saitama University

• KOBAYASHI Yoshio

  Faculty of Engineering, Saitama University

Bibliographic Information

Other Title

• 3流体モデルによる低温超伝導体の表面インピーダンスの解釈に関する検討

Abstract

It is shown that a three-fluid model, which was successfully introduced to explain microwave characteristics of high-T_c superconductors phenomenologically, is valid also to explain ones for low-T_c superconductors. In this model, two contributions of a residual normal electron in addition to a super and a normal electron in the conventional two-fluid model and of temperature(T-) dependence of momentum relaxation time τfor both these normal electrons are taken into account. Measured results of T-dependence of the surface resistance R_s for a Nb film with T_c=9.3K agree very well with an R_s curve calculated by the present model. Furthermore an improved two-fluid model, which corresponds to the case of n_<res>=0 in the three-fluid model or to a two-fluid model with τ dependent of T, is shown to agree almost perfectly with microwave characteristics of low-T_c superconductors expected from the BCS theory.

Journal

• Technical report of IEICE. SCE

  Technical report of IEICE. SCE 97 (19), 71-76, 1997-04-23

  The Institute of Electronics, Information and Communication Engineers

Keywords

• low-T_c superconductors
• microwave
• surface impedance
• conductivity

Details

• CRID: 1573105977222020864
• NII Article ID: 110003187323
• NII Book ID: AN10012885
• Text Lang: ja
• Data Source:
  • CiNii Articles