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

E. D. Mun, S. Jia, S. L. Bud'ko, and P. C. Canfield
Phys. Rev. B 86, 115110 – Published 10 September 2012

Abstract

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.

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  • Received 22 July 2010

DOI:https://doi.org/10.1103/PhysRevB.86.115110

©2012 American Physical Society

Authors & Affiliations

E. D. Mun*, S. Jia, S. L. Bud'ko, and P. C. Canfield

  • Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *Current address: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Current address: Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.

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Issue

Vol. 86, Iss. 11 — 15 September 2012

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