Treadwell, LaRico J., Watkins-Curry, Pilanda, McAlpin, Jacob D., Prestigiacomo, Joseph, Stadler, Shane, and Chan, Julia Y.
The synthesis and characterization of Mn- and Fe-substituted Ln 6W4Al43 (Ln=Gd, Yb) and Yb6Ti4Al43 are reported. The compounds adopt the Ho6Mo4Al43 structure type with lattice parameters of a~11Å and c~17.8Å with structural site preferences for Mn and Fe. The magnetization of Yb6W4Al43 is sensitive to Mn and Fe doping, which is evident by an increase in the field dependent magnetization. Gd6W4Al43, Gd6W4Al42.31(11)Mn0.69(11), and Gd6W4Al41.69(12)Fe1.30(12) order antiferromagnetically in the ab- and c-directions at 15, 14, and 13K, respectively, with positive Weiss constants, suggesting the presence of ferromagnetic exchange interactions. Anisotropic magnetization data of Gd6W4Al43−y T y (T=Mn, Fe) analogs are discussed. [ABSTRACT FROM AUTHOR]