Thermoelectric power of the YbT2Zn20 (T = Fe, Ru, Os, Ir, Rh, and Co) heavy fermions

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Mun, E. D.
Jia, S.
Bud’ko, Sergey
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Canfield, Paul
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Ames National Laboratory

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Physics and Astronomy
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The thermoelectric power, S(T), of the heavy fermions YbT2Zn20 (T = Fe, Ru, Os, Ir, Rh, and Co) has been measured to shed further light on their strong electronic correlations. A large, negative, local minimum in S(T) with approximately −70 μV/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, a highly enhanced S(T)/T value is observed for all members, although S(T) does show a deviation from a purely linear temperature dependence, S(T) = αT, for T ≠ Fe members. In the zero-temperature limit, estimated by a simple linear extrapolation, the enhanced S(T)/T value strongly correlates with the electronic specific heat coefficient, C(T)/T.


This article is published as Mun, E. D., S. Jia, S. L. Bud'Ko, and P. C. Canfield. "Thermoelectric power of the Yb T 2 Zn 20 (T= Fe, Ru, Os, Ir, Rh, and Co) heavy fermions." Physical Review B 86, no. 11 (2012): 115110. DOI: 10.1103/PhysRevB.86.115110. Posted with permission.

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Sun Jan 01 00:00:00 UTC 2012