Premium
Superconductivity and phonon softening in instable systems
Author(s) -
Postnikov V. S.,
Postnikov V. V.,
Fedorov V. M.
Publication year - 1979
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.2220920140
Subject(s) - superconductivity , softening , condensed matter physics , phonon , coupling (piping) , physics , electron , coupling parameter , materials science , quantum mechanics , metallurgy
The effect of softening of phonon modes on the coupling parameter λ for superconductors with strong electron—phonon interaction is considered by taking into account electron effects. New formulae are derived which relates the increase in coupling parameter with optical phonons λ opt for the PdH system and the increase in the parameter λ for A 3 B‐superconductors with A15‐structure to changes in the density of states at the Fermi level. Using these formulae the role of electron factor N (0) G 2 in the increasing of superconductive transition temperature T c is discussed for the most high temperature superconductors.