2,096 research outputs found
Fermion theories on a 2d torus with Wilson action improved by Pauli -- Villars regularization
Vectorial and anomaly free chiral U(1) fermion models on a 2d finite lattice
are considered. It is demonstrated both numerically and analytically that
introduction of Pauli -- Villars type regularization supresses the symmetry
breaking effects caused by the Wilson term.Comment: 17 pages, Latex, 6 eps-figure
Curie law, entropy excess, and superconductivity in heavy fermion metals and other strongly interacting Fermi liquids
Low-temperature thermodynamic properties of strongly interacting Fermi
liquids with fermion condensate are investigated. We demonstrate that the spin
susceptibility of these systems exhibits the Curie-Weiss law, and the entropy
contains a temperature-independent term. The excessive entropy is released at
the superconducting transition, enhancing the specific heat jump Delta C and
rendering it proportional to the effective Curie constant. The theoretical
results are favorably compared with the experimental data on the heavy fermion
metal CeCoIn5, as well as He-3 films.Comment: 4 pages, 2 figures. V.2: a reference added; minor changes as in the
published versio
Thermodynamic properties of Fermi systems with flat single-particle spectra
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.Comment: 5 pages, 5 figure
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