High temperature ferromagnetism in GdFe2Zn20: large, local moments embedded in the nearly ferromagnetic Fermi liquid compound YFe2Zn20
Abstract
The RFe2Zn20 series manifests strongly correlated electron behavior for the non-magnetic R = Y member and remarkably high temperature, ferromagnetic ordering (TC = 86 K) for the local moment bearing R = Gd member (a compound that is less than 5% atomic Gd). In contrast, the isostructural RCo2Zn20 series manifests a more typical ordering temperature (TN = 5.7 K for GdCo2Zn20) and YCo2Zn20 does not show signs of correlated electron behavior. Studies of R(FexCo1-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 TC 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.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.