Abstract
A general model-independent justification is given for the assertion that a superconducting transition is possible in a Fermi gas with repulsion. It is shown for a wide class of systems that at least one harmonic of the effective interaction is attractive. A relation is found between the harmonics of the effective interaction and the harmonics of the quasiparticle scattering amplitude in the gas approximation.
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Pis’ma Zh. Éksp. Teor. Fiz. 63, No. 8, 640–645 (25 April 1996)
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Baranov, M.A., Kagan, M.Y. Sign of the harmonics of the effective interaction in a Fermi gas with repulsion. Jetp Lett. 63, 680–686 (1996). https://doi.org/10.1134/1.567086
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DOI: https://doi.org/10.1134/1.567086