抄録
Complex conductivity of the superconductor (CCS) is a principal parameter in the case of estimation for surface impedance of the superconductor. Conventional investigations on CCS are based on the two fluid model. But it does not agree with experimental result especially at the low temperature. We propose then a modified two fluid model for the superconductor provided that moving electron pairs have the characteristic of equivalent loss which depends on the RF field, and both densities of super and normal electron are related by the Rate equation. The CCS and surface impedance for superconductor are formulated by using a modified two fluid model. Calculated CCS and surface impedance agree with measured results.
