Semi-analytical modeling of the coupled strain and low-temperature dependence of the normal-state resistivity in Nb3Sn

A semi-analytical modeling framework on the microscopic basis is proposed in this paper to predict the low-temperature transport properties of strained Nb3Sn superconductors. The theoretical predictions agree well with experimental observations, which indicate that the competitions between the strain state-dependent variations in the phonon spectrum and the electron density of states (DOS) are an important consideration in interpreting the coupled low temperature-strain sensitivity of resistivity in superconducting Nb3Sn. The model is helpful for identifying the scaling law describing the anomalies in the strain dependence of superconducting critical properties of Nb3Sn conductors.