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- Title
Behavior of Fermi Systems Approaching the Fermion Condensation Quantum Phase Transition from the Disordered Phase.
- Authors
Shaginyan, V. R.
- Abstract
The behavior of Fermi systems that approach the fermion condensation quantum phase transition (FCQPT) from the disordered phase is considered. We show that the quasiparticle effective mass M[sup *] diverges as M[sup *] ∝ 1/x - X[sub FC], where x is the system density and x[sub FC] is the critical point at which FCQPT occurs. Such behavior is of general form and takes place in both three-dimensional (3D) and two-dimensional (2D) systems. Since the effective mass M[sup *] is finite, the system exhibits the Landau Fermi liquid behavior. At x - X[sub FC]/X[sub FC] « 1, the behavior can be viewed as highly correlated, because the effective mass is large and strongly depends on the density. In the case of electronic systems, the Wiedemann-Franz law is valid and the Kadowaki-Woods ratio is preserved. Beyond the region x - X[sub FC]/X[sub FC] « 1, the effective mass is approximately constant and the system becomes a conventional Landau Fermi liquid.
- Subjects
FERMI surfaces; FERMIONS; PHASE transitions; QUANTUM theory
- Publication
JETP Letters, 2003, Vol 77, Issue 2, p99
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1564228