UPd2Al3-AIO(x)-Pb Giaever-type tunneling junctions were prepared employing
an in vacuo process. The high junction quality is evident by the observatio
n of the well-known superconducting density of states of the Pb counter ele
ctrode. For H-c2(Pb) < H << H-c2(UPd2Al3) an energy gap for UPd2Al3 along t
he c-axis is well-resolved This represents the first direct observation of
the superconducting density of states of a heavy-fermion-compound by spectr
oscopic means. (C) 1999 Elsevier Science B.V. All rights reserved.