Thermal conductivity of two-band superconductors

Thermal conductivity coefficient of two-zone superconductors with the paramagnetic and non-magnetic admixtures is considered at different concentrations of the latter. The density of electron states $n(\nu)$ of the one-zone superconductor with the paramagnetic admixture is also considered, which is necessary for calculating the thermal conductivity coefficient. General expression for the function $n(\nu)$ in the whole interval of frequencies is obtained, which is not connected with any restrictions on the admixture concentration.