@article{oai:sucra.repo.nii.ac.jp:00012860,
 author = {小林, 禧夫},
 issue = {10},
 journal = {IEICE transactions on electronics},
 month = {},
 note = {It 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., copyright(c)1997 IEICE
許諾番号：07RB0174　
http://www.ieice.org/jpn/trans_online/index.html, text, application/pdf},
 pages = {1269--1274},
 title = {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)},
 volume = {E80-C},
 year = {1997},
 yomi = {コバヤシ, ヨシオ}
}