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Electronic and optical properties of ternary alloys ZnxCd1−xS, ZnxCd1−xSe, ZnSxSe1−x, MgxZn1−xSe

Benchikh K., Abid H., Benchehima M.

Materials Science Poland

2017

Vol. 35, No. 1

32--39

The empirical pseudopotential method (EPM) within the virtual crystal approximation (VCA) is used to calculate the electronic and optical properties of ternary alloys ZnxCd1-xS, ZnxCd1-xSe, ZnSxSe1-x and ZnSxSe1-x. The alloy band structures and energy gaps are calculated using VCA which incorporates the compositional disorder as an effective potential. The calculated band structures for the ZnxCd1-xS, ZnxCd1-xSe, ZnSxSe1-x and ZnSxSe1-x alloys show a direct band gap in the whole range of the concentration except for the ZnSxSe1-x alloy which presents a crossover from the direct gap to the indirect one.Also the dependence of the refractive index on the concentration is calculated for each ternary alloy. This parameter is found to depend nonlinearly on the alloy concentration. A detailed comparison of our results with experimental data and works of other authors has led to a good agreement.

Study of superconducting state parameters of binary BeCAL100-C metallic glasses

Vora A. M.

Journal of Technical Physics

2007

Vol. 48, no 3-4

163-170

The theoretical investigation of the superconducting state parameters (SSP) viz. electron-phonon coupling strength λ, Coulomb pseudopotential μ*, transition temperature TC, isotope effect exponent a and effective interaction strength NoV of BeCAl100-C (at C = 10 and 30 at %) 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 TC 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 NoV show weak dependences on the local field correction functions. The TC obtained from lU-local field correction function are found to be in an excellent agreement with available theoretical or experimental data. Also, the present results are found in qualitative agreement with other such data reported earlier, what confirms the superconducting phase in the metallic glasses.