AC SUSCEPTIBILITY OF AMORPHOUS DENSE KONDO UPD2AL3

We produced an amorphous a-UPd2Al3 bulk alloy and studied the effect o f structure-disorder on heavy-fermion and superconducting properties o f the crystalline c-UPd2Al3. In the AC susceptibility of a-UPd2Al3 bet ween 0.4 and 40 K, a clear peak is detected at 3.4 K. However, no anom alous behavior has been observed at the antiferromagnetic transition t emperature of 14 K and the superconducting transition temperature of 2 K observed for c-UPd2Al3. The electrical resistivity of a-UPd2Al3 als o shows no superconducting transition down to 0.4 K. The electronic sp ecific-heat coefficient is estimated to be 195 mJ/K-2 mol from the spe cific heat results between 4.8 and 15 K. (C) 1998 Elsevier Science B.V . All rights reserved.