Six closely related YbT2Zn20 (T = Fe, Co, Ru, Rh, Os, Ir) heavy fermion compounds with large local moment degeneracy

TitleSix closely related YbT2Zn20 (T = Fe, Co, Ru, Rh, Os, Ir) heavy fermion compounds with large local moment degeneracy
Publication TypeJournal Article
Year of Publication2007
AuthorsTorikachvili MS, Jia S, Mun ED, Hannahs ST, Black RC, Neils WK, Martien D, Bud'ko SL, Canfield PC
Journal TitleProceedings of the National Academy of Sciences of the United States of America
Volume104
Pages9960-9963
Date PublishedJun
Type of ArticleArticle
ISBN Number0027-8424
Accession NumberISI:000247363000010
Keywordscorrelated electron, electron, INTERMETALLIC COMPOUND, KADOWAKI-WOODS RELATION, LIQUID BEHAVIOR, resistivity, systems, YBBIPT
Abstract

Heavy fermion compounds represent one of the most strongly correlated forms of electronic matter and give rise to low temperature states that range from small moment ordering to exotic superconductivity, both of which are often in close proximity to quantum critical points. These strong electronic correlations are associated with the transfer of entropy from the local moment degrees of freedom to the conduction electrons, and, as such, are intimately related to the low temperature degeneracy of the (originally) moment bearing ion. Here we report the discovery of six closely related Yb-based heavy fermion compounds, YbT2Zn20, that are members of the larger family of dilute rare earth bearing compounds: RT2Zn20 (T = Fe, Co, Ru, Rh, Os, Ir). This discovery doubles the total number of Yb-based heavy fermion materials. Given these compounds' dilute nature, systematic changes in T only weakly perturb the Yb site and allow for insight into the effects of degeneracy on the thermodynamic and transport properties of these model correlated electron systems.

DOI10.1073/pnas.0702757104
Alternate JournalProc. Natl. Acad. Sci. U. S. A.