Premium
Influence of Short‐Range Order on the Electron–Phonon Interaction in Disordered Binary Alloys
Author(s) -
Gurskii Z. A.,
Chushak Ya. G.
Publication year - 1992
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.2221690107
Subject(s) - condensed matter physics , phonon , binary number , electron , instability , constant (computer programming) , physics , matrix element , matrix (chemical analysis) , materials science , quantum mechanics , mathematics , arithmetic , particle physics , computer science , composite material , programming language
A microscopic theory for the investigation of the short‐range order effects on electron–phonon interaction in binary alloys is proposed. An expression for the electron–phonon matrix element is derived. Due to the presence of disorder in alloys, an additional term arises in this matrix element in comparison to the case of pure metal. The influence of pair correlations on the Eliashberg function α 2 F (ω) and the electron–phonon interaction constant in alloys of the KRb and KCs systems is investigated numerically and is analyzed. The pair correlations are shown to cause an increase of the electron–phonon interaction constant in the vicinity of the phase instability point. Under certain conditions such an increase may be essential.