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

TitleVariation of the magnetic ordering in GdT2Zn20 (T=Fe, Ru, Os, Co, Rh and Ir) and its correlation with the electronic structure of isostructural YT2Zn20
Publication TypeJournal Article
Year of Publication2008
AuthorsJia S, Ni N, Samolyuk GD, Safa-Sefat A, Dennis K, Ko H, Miller GJ, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume77
Pages104408
Date PublishedMar
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000254542700058
Keywordscobalt, ENHANCEMENT FACTOR, EXCHANGE, ferromagnetism, heat, metal, rare-earth, susceptibility, temperature, transition
Abstract

Magnetization, resistivity, and specific heat measurements were performed on solution-grown single crystals of six GdT2Zn20 (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-C for T= Fe and Ru ), whereas the Co column members manifest an antiferromagnetic (AFM) ground state. Thermodynamic measurements on YT2Zn20 revealed that the enhanced TC for GdFe2Zn20 and GdRu2Zn20 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(FexCo1-x)(2)Zn-20 and Y(FexCo1-x)(2)Zn-20, which clearly reveal the effect of 3d-band filling on their magnetic properties.

DOI10.1103/PhysRevB.77.104408
Alternate JournalPhys. Rev. B