Non-Fermi-Liquid Behavior from the Fermi-Liquid Approach

Details Non-Fermi-Liquid Behavior from the Fermi-Liquid Approach Non-Fermi-Liquid Behavior from the Fermi-Liquid Approach

2007-10-28

arxiv.org/abs/0710.5296v2

Int. J. Mod. Phys. B 21 (2007) 2077

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures, corrected list of authors

Scientific paper

10.1142/S0217979207043488

Non-Fermi liquid behavior of strongly correlated Fermi systems is derived within the Landau approach. We attribute this behavior to a phase transition associated with a rearrangement of the Landau state that leads to flattening of a portion of the single-particle spectrum $\epsilon({\bf p})$ in the vicinity of the Fermi surface. We demonstrate that the quasiparticle subsystem responsible for the flat spectrum possesses the same thermodynamic properties as a gas of localized spins. Theoretical results compare favorably with available experimental data. While departing radically from prevalent views on the origin of non-Fermi-liquid behavior, the theory advanced here is nevertheless a conservative one of in continuing to operate within the general framework of Landau theory.

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