Magnetic anomalies in Gd2PdSi3

The results of ac and de magnetic susceptibility, thermopower and Hall effect measurements of a compound, Gd2PdSi3, establish that this compound orders magnetically below T-N = 20 K. Though the ordering appears to be of an antiferromagnetic-type, the paramagnetic Curie temperature is positive with the magnitude being nearly the same as that of T-N, suggestive of the existence of ferromagnetic correlations. The thermopower at 300 K is large, apparently due to Pd 4d electrons, decreasing monotonically with temperature. There is a change in the sign of Hall constant well below T-N. Also considering the observation of Kondo-like characteristics above 21 K earlier by us, the overall thermal, transport and magnetic behaviour of this compound is interesting.