Anomalous resistivity and the origin of a heavy mass in the two-band Hubbard model with one narrow band

Abstract

We search for marginal Fermi-liquid behavior in the two-band Hubbard model with one narrow band. We consider the limit of low electron densities in the bands and strong intraband and interband Hubbard interactions. We analyze the influence of electron polaron effect and other mechanisms of mass-enhancement (related to momentum dependence of the self-energies) on effective mass and scattering times of light and heavy components in the clean case (electron - electron scattering and no impurities). We find the tendency towards phase-separation (towards negative partial compressibility of heavy particles) in a 3D case for large mismatch between the densities of heavy and light bands in a strong coupling limit. We also observe that for low temperatures and equal densities the resistivity in a homogeneous state R(T) ~ T^2 - behaves in a Fermi-liquid fashion both in 3D and 2D cases. For temperatures higher then effective bandwidth for heavy electrons T > Wh* the coherent behavior of heavy component is totally destroyed. The heavy particles move diffusively in the surrounding of light particles. At the same time the light particles scatter on the heavy ones as if on immobile (static) impurities. In this regime the heavy component is marginal, while the light one is not. The resistivity goes on saturation for T > Wh* in the 3D case. In 2D the resistivity has a maximum and localization tail due to weak - localization corrections of Altshuler - Aronov type. Such behavior of resistivity in 3D could be relevant for some uranium-based heavy-fermion compounds like UNi2Al3 and in 2D for some other mixed-valence compounds possibly including the layered manganites. We also consider briefly the superconductive (SC) instability in the model. The leading instability is towards p-wave pairing and is governed by enhanced Kohn - Luttinger mechanism of SC at low electron density.

37 pages, 9 figures, accepted for JETP

References in corpus (5)

• Hidden Orbital Order in $UR{u}_{2}S{i}_2$
• Valence Fluctuations Revealed by Magnetic Field Scan: Comparison with Experiments in YbXCu_4 (X=In, Ag, Cd) and CeYIn_5 (Y=Ir, Rh)
• Phase separation in a two-band model for strongly correlated electrons
• Phase diagram of the asymmetric Hubbard model
• Thirty Years of heavy Fermions: Scientific Setting for their Discovery and Partial Understanding

Cited by in corpus (13)

• Superconductivity from weak repulsion in hexagonal lattice systems
• Electronic phase separation: recent progress in the old problem
• Fermi-Bose mixtures and BCS-BEC crossover in high-Tc superconductors
• Fermi-to-Bose crossover in a trapped quasi-2D gas of fermionic atoms
• Effects of anisotropy and Coulomb interactions on quantum transport in a quadruple quantum-dot structure
• The Kohn-Luttinger effect and anomalous pairing in new superconducting systems and graphene
• Unconventional superconductivity in low density electron systems and conventional superconductivity in hydrogen metallic alloys under pressure
• The Kohn-Luttinger superconductivity in idealized doped graphene
• Magnetization of the Mn${}_{1-x}$Fe${}_x$Si in high magnetic field up to 50 T: possible evidence of a field-induced Griffiths phase
• Coulomb interactions induced perfect spin filtering effect in a quadruple quantum-dot cell
• Phase diagram of the Kohn-Luttinger superconducting state for bilayer graphene
• Kohn-Luttinger superconductivity in monolayer and bilayer semimetals with the Dirac spectrum
• Anomalous superconductivity and superfluidity in repulsive fermion systems