| Issue |
Europhys. Lett.
Volume 72, Number 2, October 2005
|
|
|---|---|---|
| Page(s) | 256 - 262 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10233-9 | |
| Published online | 21 September 2005 | |
Thermodynamic properties of Fermi systems with flat single-particle spectra
1
Russian Research Centre Kurchatov Institute - Moscow, 123182, Russia
2
McDonnell Center for the Space Sciences and Department of Physics Washington University - St. Louis, MO 63130, USA
Received:
28
June
2005
Accepted:
29
August
2005
The behavior of strongly correlated Fermi systems is investigated
beyond the onset of a phase transition where the single-particle
spectrum 
becomes flat. The Landau-Migdal quasiparticle
picture is shown to remain applicable on the ordered side of this transition.
Nevertheless, low-temperature properties
evaluated within this picture show profound changes relative
to results of Landau theory, as a direct consequence of the flattening
of . Stability conditions for this class of systems
are examined, and the nature
of antiferromagnetic quantum phase transitions is elucidated.
PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.30.Cr – Saturation moments and magnetic susceptibilities
© EDP Sciences, 2005
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