Variation of the magnetic ordering in GdT2Zn20 (T=Fe, Ru, Os, Co, Rh, and Ir) and its correlation with the electronic structure of isostructural YT2Zn20

Journal Article · Mon Mar 10 04:00:00 EDT 2008 · Physical Review B

OSTI ID:974034

Jia, S; Safa-Sefat, A; Dennis, K; Ko, H; Miller, G; Bud'ko, S; Canfiled, P

Magnetization, resistivity, and specific heat measurements were performed on solution-grown single crystals of six GdT{sub 2}Zn{sub 20} (T=Fe, Ru, Os, Co, Rh, and Ir) compounds, as well as on their Y analogs. For the Gd compounds, the Fe column members manifest a ferromagnetic (FM) ground state (with an enhanced Curie temperature T{sub c} for T=Fe and Ru), whereas the Co column members manifest an antiferromagnetic (AFM) ground state. Thermodynamic measurements on YT{sub 2}Zn{sub 20} revealed that the enhanced T{sub c} for GdFe{sub 2}Zn{sub 20} and GdRu{sub 2}Zn{sub 20} can be understood within the framework of Heisenberg moments embedded in a nearly ferromagnetic Fermi liquid. Furthermore, electronic structure calculations indicate that this significant enhancement is due to a large transition metal partial density of states at the Fermi level that places these compounds close to the Stoner FM criterion. The change from FM to AFM ordering (between the Fe and Co column materials) is associated with the filling of electronic states with two additional electrons/f.u. The degree of this sensitivity is addressed by the studies of the pseudoternary compounds Gd(Fe{sub x}Co{sub 1-x}){sub 2}Zn{sub 20} and Y(Fe{sub x}Co{sub 1-x}){sub 2}Zn{sub 20}, which clearly reveal the effect of 3d-band filling on their magnetic properties.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-07CH11358
• OSTI ID: 974034
• Report Number(s): IS-J 7404
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 19 Vol. 77; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CURIE POINT
ELECTRONIC STRUCTURE
FERMI GAS
FERMI LEVEL
GROUND STATES
MAGNETIC PROPERTIES
MAGNETIZATION
MONOCRYSTALS
SENSITIVITY
SPECIFIC HEAT
THERMODYNAMICS
TRANSITION ELEMENTS