Degree Type

Dissertation

Date of Award

2008

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

First Advisor

Paul C. Canfield

Second Advisor

Sergey L. Bud'ko

Third Advisor

Bruce N. Harmon

Abstract

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.

DOI

https://doi.org/10.31274/rtd-180813-16948

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Shuang Jia

Language

en

Proquest ID

AAI3330737

OCLC Number

316235050

ISBN

9780549864837

File Format

application/pdf

File Size

211 pages

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