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Dynamic Spin Susceptibility of an Interacting Electron Gas
Author(s) -
Choudhury S. K.,
Mohanty S. P.
Publication year - 1980
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.2221010133
Subject(s) - decoupling (probability) , electron , spin (aerodynamics) , physics , coulomb , fermi gas , function (biology) , condensed matter physics , moment (physics) , simple (philosophy) , microscopic theory , quantum mechanics , chemistry , thermodynamics , control engineering , engineering , philosophy , epistemology , evolutionary biology , biology
A simple theory of dynamic spin susceptibility χ( q , ω) of an interacting electron gas is presented by using the equation of motion method for the double time retarded Green's function. A suitable moment conserving decoupling approximation is used and an expression for χ( q , ω) is obtained which is quite general and results of all previous authors can be obtained from it in appropriate limits. The enhancement function I ( q ), in the theory shows a peak at q ≈ 2q F . By using a screened Coulomb potential and an effective mass approximation, the exchange enhancement of the spin susceptibility of alkali metals is calculated and the results agree quite well with experiments.