Woodard–Cody anomalous resistivity in a Nb5Ge3C0.3 superconductor compound

A normal-state electrical resistivity of a superconducting Nb5Ge3C0.3 compound is investigated. Resistivity data are taken from the superconducting transition temperature Tc at room temperature. The data are discussed based on important theoretical expressions in order to explain the normal-state resistivity of the Nb5Ge3C0.3 compound. Focusing on the best fitting Woodward and Cody model is used. An 0.77 electron–phonon coupling (λ) is determined, which induces an important role of the electron–phonon coupling for a Nb5Ge3C0.3 compound. The saturation of the ρ(T) at 300 K indicates that the mean free path l of the carriers is actually longer than the unit cell dimensions. The negative curvature of this superconductor is a result of the mean free path non-linear in their resulting perturbation. It is also found that the magnitude of the temperature-dependent (phonon) correlated with the resistivity decreases with the decreasing of the mean free path in the absence of phonons due to an atomic disorder induced by lattice intrinsic defects.