Thermoelectric Power of the YbT${}_2$Zn${}_{20}$ (T = Fe, Ru, Os, Ir, Rh, and Co) Heavy Fermions

Abstract

The thermoelectric power, $S(T)$, of the heavy fermions YbT${}_2$Zn${}_{20}$ ($T$ = Fe, Ru, Os, Ir, Rh, and Co) has been measured to characterize their strong electronic correlations. A large, negative, local minimum in $S(T)$ with approximately -70 $\mu$V/K is found for all compounds. From the observed local minimum, the energy scales associated with both the Kondo temperature and the crystalline electric field splitting are deduced and compared to previous specific heat measurements. At low temperatures, $S(T)$ follows a linear temperature dependence, $S(T)$ = $\alpha T$, with an enhanced value of $\alpha$ which is characteristic for a heavy fermion state. In the zero temperature limit, the enhanced $\alpha$ value strongly correlates with the electronic specific heat coefficient, $C(T)/T$, due to the large density of states at the Fermi level.

References in corpus (7)

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• Probing the phase diagram of CeRu_2Ge_2 by thermopower at high pressure

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• Enhancement of the thermoelectric power by electronic correlations in bad metals: a study of the Kelvin formula
• Tuning the Kondo effect in Yb(Fe${}_{1-x}$Co${}_x$)${}_2$Zn${}_{20}$
• Collapse of Kondo state and ferromagnetic quantum phase transition in YbFe${}_2$Zn${}_{20}$
• Dependence of transport coefficients of Yb(Rh${}_{1-x}$Co${}_x$)${}_2$Si${}_2$ intermetallics on temperature and cobalt concentration
• Comment on "Unconventional enhancement of ferromagnetic interactions in Cd-doped GdFe2Zn20 single crystals studied by ESR and 57Fe Mossbauer spectroscopies"
• Structural Trends and Itinerant Magnetism of the New Cage-structured Compound HfMn${}_2$Zn${}_{20}$