Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-07-24
Physics
Condensed Matter
Strongly Correlated Electrons
submitted to PRB
Scientific paper
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.
Bud'ko Sergey L.
Canfield Paul. C.
Jia Suotang
Mun Eun Deok
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