Myriad of correlated electron effects found in the RT2Zn20 family

TitleMyriad of correlated electron effects found in the RT2Zn20 family
Publication TypeJournal Article
Year of Publication2008
AuthorsCanfield PC, Jia S, Mun ED, Bud'ko SL, Samolyuk GD, Torikachvili MS
Journal TitlePhysica B-Condensed Matter
Volume403
Pages844-846
Date PublishedApr
Type of ArticleProceedings Paper
ISBN Number0921-4526
Accession NumberISI:000254689900047
Keywordsco, DEGENERACY, fermi-liquid, heavy fermions, Kadowaki-Woods plot, ni, RH, ru, Stoner limit
Abstract

The dilute, rare earth bearing family of RT2Zn20 (R = rare earth, T = transition metal) intermetallic compounds can be tuned to a nearly ferromagnetic Fermi liquid that is closer to the Stoner limit than Pd (for R = Y, Lu and T = Fe). The submersion of moment bearing rare earths (Gd-Tm) into this highly polarizable matrix gives rise to exceptionally high temperature ferromagnetism (e.g. T-C = 86 K for GdFe2Zn20) for a compound with only one moment bearing ion out of 23 in the formula unit. In addition to this d-shell correlated electron behavior, 4f hybridization gives rise to six, new, Yb-based heavy fermion compounds: YbT2Zn20 (T = Fe, Ru, Os, Co, Rh, Ir). These half dozen compounds manifest a range of Yb ion degeneracy values (N) for T similar to TK, ranging from N = 4-8. Not only do these compounds offer a clear testing ground for the effects of low temperature degeneracy on the correlated electron state, they also present an exceptionally clear experimental confirmation of the generalized Kadowaki-Woods formalism. (c) 2007 Elsevier B.V. All rights reserved.

DOI10.1016/j.physb.2007.10.234
Alternate JournalPhysica B