Thermodynamic properties of Fermi systems with flat single-particle spectra

2005/02/11 by V. A. Khodel, V. A Khodel, J. W. Clark +3 · 5 citations
Materials Science · Physics and Astronomy · #Antiferromagnetism #Fermi Gamma-ray Space Telescope #Flattening #Iron-based superconductors research #Phase (matter) #Phase transition #Physics of Superconductivity and Magnetism #Quantum phase transition #Quasiparticle #Rare-earth and actinide compounds #Spectral line #cond-mat.str-el

paper · pdf · doi:10.1209/epl/i2005-10233-9

published in Europhysics Letters (EPL) 72(2), 256-262 (Institute of Physics) · 5 pages, 5 figures

arxiv created 2005/02/11 · openalex publication_date 2005/09/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The behavior of strongly correlated Fermi systems is investigated beyond the onset of a phase transition where the single-particle spectrum ξ( p ) 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 ξ( p ). Stability conditions for this class of systems are examined, and the nature of antiferromagnetic quantum phase transitions is elucidated.

Citations

• The break-up of heavy electrons at a quantum critical point
• Universal behavior of heavy-fermion metals near a quantum critical point
• Quantum critical phenomena
• The multi-connected momentum distribution and fermion condensation