Myriad of correlated electron effects found in the RT2 Zn20 family

P. C. Canfield, S. Jia, E. D. Mun, S. L. Bud'ko, G. D. Samolyuk, M. S. Torikachvili

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The dilute, rare earth bearing family of RT2 Zn20 (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. TC = 86 K for GdFe2 Zn20) 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: YbT2 Zn20 (T = Fe, Ru, Os, Co, Rh, Ir). These half dozen compounds manifest a range of Yb ion degeneracy values (N) for T ∼ 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.

Original languageEnglish
Pages (from-to)844-846
Number of pages3
JournalPhysica B: Physics of Condensed Matter
Volume403
Issue number5-9
DOIs
StatePublished - Apr 1 2008
Externally publishedYes

Keywords

  • Fermi-liquid
  • Heavy fermions
  • Kadowaki-Woods plot
  • Stoner limit

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