Abstract
Any metal can be considered as a Fermi sea of electrons which moves within a crystalline lattice. Each of these conduction or “free” electrons strongly interacts with ions of the lattice. Besides, there exists a strong interaction among electrons. Actually, the potential energy of the conduction electrons in metals is of the same order as their kinetic energy. However, it appears that this strongly interacting system of conduction electrons (electron liquid) in many aspects behaves like a system of noninteracting particles (electron gas) affected by the electric field of the crystalline lattice. This similarity is the basis of a phenomenological theory of Fermi liquids. This theory was first proposed by Landau for neutral Fermi liquids in [77], [78] and then generalized by Silin for charged Fermi liquids like the electron liquid of metals [4].
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