Abstract
We have succeeded in synthesizing a new Yb-based Kondo lattice system, YbNi 3 X 9 ( X = Al, Ga). Our study reveals that YbNi 3 Al 9 shows typical features of a heavy-fermion antiferromagnet with a Neel temperature of T N = 3.4 K. All of the properties reflect a competition between the Kondo effect and the crystalline electric field (CEF) effect. The moderate heavy-fermion state leads to an enhanced Sommerfeld coefficient of 100 mJ/(mol·K 2 ), even if ordered antiferromagnetically. On the other hand, the isostructural gallide YbNi 3 Ga 9 is an intermediate-valence system with a Kondo temperature of T K = 570 K. A large hybridization scale can overcome the CEF splitting energy, and a moderately heavy Fermi-liquid ground state with high local moment degeneracy should form at low temperatures. Note that the quality of single-crystalline YbNi 3 X 9 is extremely high compared with those of other Yb-based Kondo lattice compounds. We conclude that YbNi 3 X 9 is a suitable system for investigating the electronic s...
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