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T e Formula for Strong‐Coupling Superconductivity in Random Narrow‐Band Alloys
Author(s) -
Beckmann A.,
Kolley E.,
Kolley W.
Publication year - 1983
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.2221200214
Subject(s) - superconductivity , renormalization , condensed matter physics , coupling (piping) , effective mass (spring–mass system) , superconducting transition temperature , operator (biology) , physics , basis (linear algebra) , phonon , materials science , quantum mechanics , chemistry , mathematics , biochemistry , geometry , repressor , transcription factor , metallurgy , gene
The transition temperature T c of strong‐coupling superconducting alloys A c B 1‐c is determined with emphasis to tight‐binding. Local random Eliashberg‐type equations are configuration averaged by means of an effective mass operator on the basis of the CPA. Contrary to the McMillan form the resulting T c formula involves two different phonon‐mediated coupling parameters. The electron‐phonon mass enhancement is originated from a complex renormalization factor.