LOW-TEMPERATURE TRANSPORT-PROPERTIES OF U2RH2SN AND U2FE2SN

Magnetoresistivity measurements of polycrystalline U2Rh2Sn in an appli ed magnetic field of 8.29 T reveal a sharp minimum at the antiferromag netic transition temperature T-N congruent to 20 K. The thermoelectric power of U2Rh2Sn exhibits negative values for temperatures T less tha n or similar to 24 K. At T congruent to 4 K, a large decrease in resis tivity with lowering of temperature is observed for polycrystalline U2 Fe2Sn. This anomaly originates from the occurrence of free tin on the grain boundaries of the sample giving a decrease in resistivity as a r esult of superconductivity.