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Electron–Electron Interaction and Isotope Effects in Superconducting Metal–Hydrogen (Deuterium) Systems Like PdH x (D x )
Author(s) -
Drechsler S.L.,
Zhernov A. P.
Publication year - 1985
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.2221300139
Subject(s) - kinetic isotope effect , superconductivity , pseudopotential , deuterium , electron , anharmonicity , coulomb , hydrogen , condensed matter physics , metallic hydrogen , chemistry , stoichiometry , atomic physics , physics , nuclear physics , organic chemistry
Using various experimental and theoretical data the origin of the inverse isotope effect (IIE) for the superconducting transition temperature T c of the PdH(D) system is analyzed on the basis of a solution of the Berk‐Schrieffer equations. It is found that the IIE can be described at weak or intermediate anharmonicity of the electron–optical phonon interaction β = (λ 2 D / 2 H−1≈to 0.14, standard or slightly enhanced values of Coulomb pseudopotential μ', and weak spin fluctuations λ sp ≈ 0.05 to 0.1. The importance of the electron‐electron interaction in determining the superconducting properties of non‐stoichiometric PdH x (D x ) and some other hydrides (deuterides) is emphasized.