Theoretical investigation of superconducting state parameters of binary metallic glasses $Cu_{1-c}Sn_c$

Özet

Superconducting state parameters (SSP) viz. electron-phonon coupling strength $\lambda$, Coulomb pseudopotential $\mu^{\ast}$, transition temperature $T_C$, isotope effect exponent $\alpha$ and effective interaction strength NoV of seven $Cu_{1-c}Sn_c$ binary metallic glasses have been reported using Ashcroft's empty core (EMC) model potential for the first time. Five local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used in the present investigation to study the screening influence on the aforesaid properties. The $T_C$ obtained from H-local field correction function are found in qualitative agreement with available experimental data and show linear nature with the concentration c of element Sn. A linear Tc equation is proposed by fitting the present outcomes for H-local field correction function, which is in conformity with other results for the experimental data. Also, the present results are found in qualitative agreement with other such earlier reported data, which confirms the superconducting phase in the metallic glasses.