Superconductivity and phonon softening in instable systems | Zendy

Postnikov V. S. | Zendy; Postnikov V. V. | Zendy; Fedorov V. M. | Zendy

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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.

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