Date of Award
Doctor of Philosophy
Physics and Astronomy
Paul C. Canfield
Sergey L. Bud'ko
Bruce N. Harmon
Single crystals of RT2Zn20 compounds were grown from Zn self-flux. Thermodynamic and transport measurements indicated that YFe2Zn20 is closer to the Stoner criteria. As a result of local moments embedded in this highly polarizable Fermi liquid, remarkably high-temperature ferromagnetic ordering was found for RFe 20Zn20 (R = Gd - Tm). Furthermore, pseudo-ternary compounds GdxY1-xFe2Zn20 manifest ferromagnetic ordering above 1.8 K for Gd concentrations x>0.02. In contrast, for the isostructural RCo2Zn20 series, only Gd and Tb compounds manifest antiferromagnetic ordering above 2 K, correspondent a 'normal metal' behavior of YCo2Zn 20. Six Yb compounds (YbT2Zn20, T = Fe, Co, Ru. Rh, Os and Ir) were proved to be heavy fermion compounds associated with different Fermi liquid state.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Jia, Shuang, "Magnetic properties of RT2Zn20 R = rare earth, T = Fe, Co , Ru, Rh , Os and Ir" (2008). Retrospective Theses and Dissertations. 15741.