Strongly correlated Fermi-systems: Non-Fermi liquid behavior, quasiparticle effective mass and their interplay

Basing on the density functional theory of fermion condensation, we analyze the non-Fermi liquid behavior of strongly correlated Fermi-systems such as heavy-fermion metals. When deriving equations for the effective mass of quasiparticles, we consider solids with a lattice and homogeneous systems. We...

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Bibliographic Details
Published in:Physics letters. A 2009-06, Vol.373 (26), p.2281-2286
Main Authors: Shaginyan, V.R., Amusia, M.Ya, Popov, K.G.
Format: Article
Language:English
Subjects:
Energy scales
Heavy-fermion metals
Magnetic entropy
Magnetoresistance
Quantum criticality
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Summary:Basing on the density functional theory of fermion condensation, we analyze the non-Fermi liquid behavior of strongly correlated Fermi-systems such as heavy-fermion metals. When deriving equations for the effective mass of quasiparticles, we consider solids with a lattice and homogeneous systems. We show that the low-temperature thermodynamic and transport properties are formed by quasiparticles, while the dependence of the effective mass on temperature, number density, magnetic fields, etc., gives rise to the non-Fermi liquid behavior. Our theoretical study of the heat capacity, magnetization, energy scales, the longitudinal magnetoresistance and magnetic entropy are in good agreement with the remarkable recent facts collected on the heavy-fermion metal YbRh 2 Si 2 .
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2009.04.046