Anomalous phase transitions in the heavy fermion compound Ce3Ir4Sn13

We have measured temperature dependence of magnetic susceptibility, resistivity, Hall coefficient, and lattice constant of Ce3Ir4Sn13 in order to clarify the origin of anomalies at 0.6 and 2 K in specific heat. The susceptibility measurement indicates that the anomaly at 0.6 K is due to an antiferromagnetic ordering. The Hall coefficient, resistivity, and lattice constant exhibit a sharp change at 2 K, indicating that the transition at 2 K involves a change of the band structure accompanied by a lattice expansion below the transition temperature. (c) 2005 Published by Elsevier B.V.