Variation of the magnetic ordering in Gd T2 Zn20 (T=Fe, Ru, Os, Co, Rh and Ir) and its correlation with the electronic structure of isostructural Y T2 Zn20

Shuang Jia, Ni Ni, G. D. Samolyuk, A. Safa-Sefat, K. Dennis, Hyunjin Ko, G. J. Miller, S. L. Bud'ko, P. C. Canfield

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Abstract

Magnetization, resistivity, and specific heat measurements were performed on solution-grown single crystals of six Gd T2 Zn20 (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 TC for T=Fe and Ru), whereas the Co column members manifest an antiferromagnetic (AFM) ground state. Thermodynamic measurements on Y T2 Zn20 revealed that the enhanced TC for GdFe2 Zn20 and GdRu2 Zn20 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 (Fex Co1-x) 2 Zn20 and Y (Fex Co1-x) 2 Zn20, which clearly reveal the effect of 3d -band filling on their magnetic properties.

Original languageEnglish
Article number104408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number10
DOIs
StatePublished - Mar 10 2008
Externally publishedYes

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