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Screening dependence of superconducting state parameters of Cu–Zr metallic glasses
Author(s) -
Sharma S.,
Khan H.,
Sharma K. S.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200402039
Subject(s) - pseudopotential , superconductivity , condensed matter physics , coulomb , exponent , dielectric , materials science , yield (engineering) , work (physics) , coupling (piping) , physics , thermodynamics , electron , quantum mechanics , metallurgy , linguistics , philosophy , optoelectronics
The screening dependence of superconducting state parameters ( λ , μ *, T c , α and N 0 V ) of nine metallic glasses of the Cu–Zr system has been studied in the BCS–Eliashberg–McMillan framework by employing five forms of dielectric screening function in conjunction with Ashcroft's potential. It is observed that the electron–phonon coupling strength ( λ ) and transition temperature ( T c ) are quite sensitive to the form of the dielectric screening, whereas the Coulomb pseudopotential ( μ *), isotope effect exponent ( α ) and effective interaction strength ( N 0 V ) show weak dependences on screening function. The RPA form of dielectric screening is observed to yield the best results for all the glasses of the Cu–Zr system studied in the present work. Present computations yield almost linear variation of T c with concentration x of Cu in the Cu–Zr system, which is in agreement with the experimental data. A linear T c equation is proposed by fitting the present results for RPA screening, which is in conformity with other results for the experimental data. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)