Physical properties of GdFe2(AlxZn1-x)(20)

TitlePhysical properties of GdFe2(AlxZn1-x)(20)
Publication TypeJournal Article
Year of Publication2011
AuthorsNi N, Jia S, Samolyuk GD, Kracher A, Sefat AS, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Date Published02
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000287359500005
Keywordsco, heavy-fermion compounds, RH, rt2zn20, ru, temperature

The high ferromagnetic ordering temperature of the dilute, rare-earth-bearing, intermetallic compound GdFe2Zn20 has been understood as being the consequence of the Gd3+ moment being embedded in a nearly ferromagnetic Fermi liquid. To test this understanding in detail, single crystals of the pseudoternary series GdFe2(AlxZn1-x)(20) (x <= 0.122) and YFe2(AlxZn1-x)(20) (x <= 0.121) were grown out of Zn-rich solution. Magnetization, heat capacity, and resistivity measurements show that, with Al doping, the ferromagnetic phase transition temperatures of the GdFe2(AlxZn1-x)(20) compounds decrease from 86 K (x = 0) to 10 K (x = 0.122); for the nonmagnetic analog, the YFe2(AlxZn1-x)(20) series, the Stoner enhancement factor Z decreases from 0.88 (x = 0) to 0.35 (x = 0.121) in a similar manner. Tight-binding linear-muffin-tin orbital atomic-sphere approximation band structure calculations are used to rationalize this trend. These results, together with the earlier studies of the R(Fe1-xCox)(2)Zn-20 (R = Gd and Y) series, clearly highlight the importance of band filling and the applicability of even a simple, rigid-band model to these compounds.

URL<Go to ISI>://000287359500005
Alternate JournalPhys. Rev. B