Enhancement of thermal transport in the degenerate periodic Anderson model

Abstract

The low-temperature transport coefficients of the degenerate periodic SU(N) Anderson model are calculated in the limit of infinite correlation between {\it f} electrons, within the framework of dynamical mean-field theory. We establish the Fermi liquid (FL) laws in the clean limit, taking into account the quasiparticle damping. The latter yields a reduced value of the Lorenz number in the Wiedemann-Franz law. Our results indicate that the renormalization of the thermal conductivity and of the Seebeck coefficient can lead to a substantial enhancement of the electronic thermoelectric figure-of-merit at low temperature. Using the FL laws we discuss the low-temperature anomalies that show up in the electrical resistance of the intermetallic compounds with Cerium and Ytterbium ions, when studied as a function of pressure. Our calculations explain the sharp maximum of the coefficient of the $T^2$-term of the electrical resistance and the rapid variation of residual resistance found in a number of Ce and Yb intermetallics at some critical pressure.

arXiv comment14 pages

References in corpus (13)

• Signatures of valence fluctuations in CeCu2Si2 under high pressure
• On the thermoelectricity of correlated electrons in the zero-temperature limit
• Universality in heavy-fermion systems with general degeneracy
• Theory of the thermoelectricity of intermetallic compounds with Ce or Yb ions
• Huge Enhancement of Impurity Scattering due to Critical Valence Fluctuations in a Ce-Based Heavy Electron System
• Non-generality of the Kadowaki-Woods ratio in correlated oxides
• Theory of Quasi-Universal Ratio of Seebeck Coefficient to Specific Heat in Zero-Temperature Limit in Correlated Metals
• Energy scales of Lu(1-x)Yb(x)Rh2Si2 by means of thermopower investigations
• Generalized Kadowaki-Woods Relation in Heavy Fermion Systems with Orbital Degeneracy
• Dynamics and scaling in the periodic Anderson model
• Dynamics and transport properties of heavy fermions: theory
• Calorimetric and transport investigations of CePd_{2+x}Ge_{2-x} (x=0 and 0.02) up to 22 GPa
• High-pressure transport properties of CeRu_2Ge_2

Cited by in corpus (5)

• The thermopower as a signature of quantum criticality in heavy fermions
• Multiple temperature scales of the periodic Anderson model: the slave bosons approach
• The thermopower as a fingerprint of the Kondo breakdown quantum critical point
• Enhancement of the thermoelectric power by electronic correlations in bad metals: a study of the Kelvin formula
• The LDA+DMFT route to identify good thermoelectrics