Single Crystal Growth and Transport Properties of RRu2Al10 (R = La and Pr)

We have succeeded in growing single crystals of RRu 2 Al 10 (R = La and Pr), and measured their electrical resistivity and Hall effect to gain the deeper insight of the physical properties of CeRu 2 Al 10 which exhibits an unusual long-range order (LRO) below T 0 ∼27 K. The temperature dependences of the electrical resistivity of both LaRu 2 Al 10 and PrRu 2 Al 10 show the typical metallic behavior without any phase transition. The Hall effect measurements reveal that the carrier number of CeRu 2 Al 10 in the LRO region is about 30 times smaller than that of LaRu 2 Al 10 , indicating highly different electronic states between these compounds below T 0 .