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arXiv · 1104.4167

Kondo Effects and Multipolar Order in the cubic PrTr2Al20 (Tr=Ti, V)

Akito Sakai·Satoru Nakatsuji
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Abstract

Our single crystal study reveals that PrTr2Al20 (Tr = Ti and V) provides the first examples of a cubic Γ3 nonmagnetic ground doublet system that shows the Kondo effect including a -ln T dependent resistivity. The Γ3 quadrupolar moments in PrV2Al20 induce anomalous metallic behavior through hybridization with conduction electrons, such as T^{1/2} dependent resistivity and susceptibility below ~ 20 K down to its ordering temperature T_O = 0.6 K. In PrTi2Al20, however, quadrupoles are well-localized and exhibit an order at T_O = 2.0 K. Stronger Kondo coupling in PrV2Al20 than in PrTi2Al20 suppresses quadrupolar ordering, and instead promotes hybridization between the Γ3 doublet and conduction electrons, leading to most likely the quadrupolar Kondo effect.

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Akito Sakai, Satoru Nakatsuji. 2011-04-21. Kondo Effects and Multipolar Order in the cubic PrTr2Al20 (Tr=Ti, V). https://doi.org/10.1143/jpsj.80.063701

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