Thermal and electronic transport in CeRu 2 Al 10 : Evidence for a metal–insulator transition

A first report of physical properties of the ternary intermetallic compound CeRu2Al10 is given. The electrical resistivity below room temperature shows activated behaviour with a narrow gap of Δ≃20K before the onset of a sharp peak in ρ(T) below T*=27K. The Hall coefficient as well as the thermoelectric power are overall positive, and both increase in a similarly sharp manner below T*. The lattice part of the thermal conductivity indicates...