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28 March 2024
 
  » arxiv » cond-mat/0606615

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High temperature ferromagnetism in GdFe2Zn20: large, local moments embedded in the nearly ferromagnetic Fermi liquid compound YFe2Zn20
S. Jia ; S. L. Bud’ko ; G.D. Samolyuk ; P. C. Canfield ; PostScript ; PDF ; Other formats ;
Date 23 Jun 2006
Subject Strongly Correlated Electrons
AbstractThe RFe$_2$Zn$_{20}$ series manifests strongly correlated electron behavior for the non-magnetic R = Y member and remarkably high temperature, ferromagnetic ordering ($T_C$ = 86 K) for the local moment bearing R = Gd member; for a compound that is less than 5% atomic Gd. In contrast, the isostructural RCo$_2$Zn$_{20}$ series manifests a more typical ordering temperature ($T_N$ = 5.7 K for GdCo$_2$Zn$_{20}$) and YCo2Zn20 does not show any signs of correlated electron behavior. Studies of R(Fe_xCo_{1-x))2Zn20 (R = Gd, Y), combined with bandstructure calculations for the end members, reveal that YFe2Zn20 is a nearly ferromagnetic Fermi liquid and that the remarkably high T_C associated with GdFe2Zn20 is the result of submerging a large local moment into such a highly polarizable matrix. These results indicate that the RFe2Zn20 series, and more broadly the RT2Zn20 (T = Fe, Co, Ni, Mn, Ru, Rh, Os, Ir, Pt) isostructural family of compounds, offer an exceptionally promising phase space for the study of the interaction between local moment and correlated electron effects near the dilute R limit.
Source arXiv, cond-mat/0606615
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