Abstract
A ternary intermetallic compound, U${}_{3}$Ru${}_{4}$Al${}_{12}$ in a single-crystal form, was studied by measurement of susceptibility, magnetization, electrical resistivity, magnetoresistivity, thermopower, and heat capacity, as well as neutron diffraction, revealing that this aluminide is an antiferromagnetically ordered (${T}_{\mathrm{N}}$ $=$ 9.5 K) dense Kondo system (${T}_{\mathrm{K}}$ \ensuremath{\approx} 30 K) with a considerable enhancement of the Sommerfeld coefficient $\ensuremath{\gamma}$(0) of about $200\phantom{\rule{0.28em}{0ex}}{\mathrm{mJ}\phantom{\rule{0.28em}{0ex}}\mathrm{mol}}_{\mathrm{U}}^{\ensuremath{-}1}\phantom{\rule{0.28em}{0ex}}{\mathrm{K}}^{\ensuremath{-}2}$. The electrical resistivity and thermopower of U${}_{3}$Ru${}_{4}$Al${}_{12}$ show characteristic features of the interplay between anisotropic magnetic exchange, Kondo, and crystal field effects. A pronounced in-plane anisotropy and a unique noncollinear antiferromagnetic structure in the (a,b) hexagonal plane, found by neutron diffraction, are discussed in view of the effect of geometrical frustration caused by the distorted kagome lattice of a Gd${}_{3}$Ru${}_{4}$Al${}_{12}$-type crystal structure. Thus, the overall behavior of U${}_{3}$Ru${}_{4}$Al${}_{12}$ resembles that observed for the orthorhombic compound UCu${}_{5}$In, reported earlier as a spin density wave material.
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