Sublattice contributions to the magnetism of UFe5Al7 and UFe6Al6

Synthesis, Structure, and Magnetic and Electrical Properties of Yb(Mn,M)xAl12–x (M = Fe, Ru; x ≤ 2.5) Phases

“…Motivation to grow single crystals of ternary LnM x Al 12– x (Ln = lanthanide, M = Mn or Fe) compounds lies in probing a rich variety of physical phenomena . It has been shown that variability of M concentrations in LnM x Al 12– x compounds of the ThMn 12 structure type can impact their magnetic properties. ,,,, The diverse nature of magnetism in these compounds, in addition to interesting behavior such as negative magnetoresistance, points to a complex interplay between possibly competing exchange interactions as exhibited in YFe x Mn 12‑ x , ErFe x Mn 12– x , DyFe 6 Al 6 , and many others. − In Fe-rich compounds such as GdFe 6 Al 6 and GdFe 4 Al 8 (ThMn 12 structure), Fe–Fe interactions result in high ordering temperatures (ferromagnetic order at T C ∼ 345 K for GdFe 6 Al 6 and at T C ∼ 172 K for GdFe 4 Al 8 ). Alternatively, for LnFe 2 Al 10 (YbFe 2 Al 10 -type) compounds with magnetic lanthanides (Ln = Sm–Tm), ordering temperatures are much lower (<20 K), and magnetic interactions are attributed to the lanthanide sublattice .…”