Enhancement of thermal transport in the degenerate periodic Anderson model (CROSBI ID 145915)
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Podaci o odgovornosti
Zlatić, Veljko ; Monnier, Rene ; Freericks, Jim
engleski
Enhancement of thermal transport in the degenerate periodic Anderson model
The low-temperature transport coefficients of the degenerate periodic SU(N) Anderson model are calculated in the limit of infinite correlation between 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 T2 term of the electrical resistance and the rapid variation in residual resistance found in a number of Ce and Yb intermetallics at some critical pressure.
strong correlations; enhanced thermal transport
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Podaci o izdanju
78 (4)
2008.
045113-1-045113-14
objavljeno
1098-0121
10.1103/PhysRevB.78.045113
Povezanost rada
Fizika