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Phonon Dispersion in Amorphous Ni-Alloys

100%
Vora A.
Acta Physica Polonica A
|
2007
|
vol. 111
|
issue 6
859-871
EN
The well-known model potential is used to investigate the longitudinal and transverse phonon dispersion curves for six Ni-based binary amorphous alloys, viz. Ni_{31}Dy_{69}, Ni_{33}Y_{67}, Ni_{36}Zr_{64}, Ni_{50}Zr_{50}, Ni_{60} Nb_{40}, and Ni_{81}B_{19}. The thermodynamic and elastic properties are also computed from the elastic limits of the phonon dispersion curves. The theoretical approach given by Hubbard-Beeby is used in the present study to compute the phonon dispersion curves. Five local field correction functions proposed by Hartree, Taylor, Ichimaru-Utsumi, Farid et al. and Sarkar et al. are employed to see the effect of exchange and correlation in the aforesaid properties.
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Screening Dependence Study of Superconducting State Parameters of 4d- and 5d-Transition Metals Based Binary Alloys

51%
Dave H., Malan R., Vora A.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 1
86-93
EN
Screening dependence study of the superconductivity in 4d- and 5d-transition metals based binary alloys was performed using the model pseudopotential approach, which was found quite successful in explaining superconductivity in metals, alloys, and metallic glasses. In the present work the superconducting state parameters viz. electron-phonon coupling strength λ, the Coulomb pseudopotential μ*, transition temperature T_{C}, isotope effect exponent α and effective interaction strength N₀ V of some transition metals based binary alloys of 4d- and 5d-transition metals groups were determined in the BCS-Eliashberg-McMillan framework. A considerable influence of various exchange and correlation functions on λ and μ* is found from the present study. The present results of the superconducting state parameters are found in qualitative agreement with the available experimental figures wherever exist.
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