Electron-Phonon Interaction and Superconductivity in NaSn₃ Intermetallic Compound

In this study, the superconducting properties of NaSn3 — an intermetallic compound with an AuCu3-type crystal structure and space group Pm3m (221), where Na atoms occupy the corners and Sn atoms are in face-centered positions — were investigated. The critical temperature of superconductivity (TC) in NaSn3 is found to be 7.038 K. The electron–phonon coupling constant has been calculated to assess its role in superconductivity, with the aim of understanding the mechanisms that enable NaSn3 to reach a relatively high TC. The analysis includes the calculation of the superconducting order parameter, the wave function renormalization factor for the first Matsubara frequency as a function of temperature, and the specific heat in both the superconducting and normal states. The results provide insight into the electron–phonon interaction and its contribution to the superconducting state in NaSn3, offering a detailed perspective on its potential for higher-temperature superconductivity.