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

TitleThermoelectric power of the YbT2Zn20 (T = Fe, Ru, Os, Ir, Rh, and Co) heavy fermions
Publication TypeJournal Article
Year of Publication2012
AuthorsMun ED, Jia S, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume86
Pages115110
Date Published09
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000308528200002
KeywordsCE, DEGENERACY, KADOWAKI-WOODS RELATION, PHYSICAL-PROPERTIES, resistivity, seebeck coefficient, systems, thermopower, transport-properties, zero-temperature limit
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 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, 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) = alpha T, for T not equal 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

URL<Go to ISI>://WOS:000308528200002
DOI10.1103/PhysRevB.86.115110
Alternate JournalPhys. Rev. B