Superconducting state parameters of Cu xZr 100− x binary metallic glasses

Abstract

The screening dependence investigations 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 N O V of 10 binary Cu x Zr 100− x ( x = 0.25, 0.30, 0.33, 0.35, 0.40, 0.45, 0.50, 0.55, 0.57 and 0.60) metallic glasses have been reported using Ashcroft’s empty core (EMC) model potential. 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. 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 N O V show weak dependences on the 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 and show almost linear nature with the concentration ‘ x’ of Cu element. A linear T C equation is proposed by fitting the present outcomes for IU-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.