Superconducting state parameters of CuCZr100-C metallic glasses

Abstract

The theoretical investigation of the superconducting state parameters (SSP) viz. electron-phonon coupling strength λ, Coulomb pseudopotential μ^* , transition temperature T_c, isotope effect exponent α and effective interaction strength N₀V of ten Cu_CZr_100-C metallic glasses have been reported using Ashcroft s empty core (EMC) model potential. Three local field correction functions proposed by Hartree (H), Taylor (T) and Ichimaru-Utsumi (IU) are used in the current investigation to study the screening influence on the aforesaid properties. It is observed that the electron-phonon coupling strength λ and the transition temperature T_c are quite sensitive to the selection of the local field correction functions, whereas the Coulomb pseudopotential μ^*, isotope effect exponent α and effective interaction strength N₀V show weak dependences on local field correction functions. The T_c obtained from IU-local field correction function are found an excellent agreement with available theoretical or experimental data. Also, the present results are found in qualitative agreement with other such earlier reported data, which confirms the superconducting phase in metallic glasses.

Keywords

pseudopotential, superconducting state parame-ters, Cu-Zr metallic glasses