Order parameter symmetry in UPd2Al3

The heavy fermion compound UPd2Al3 has attracted much interest on account o f the coexistence of antiferromagnetism and superconductivity at temperatur es below 2 K. The antiferromagnetic fluctuations provide a window on the lo w-frequency dynamics in this material. By an analysis of neutron scattering data, and taking into consideration results from other experimental probes , it is suggested which sheet(s) of the f-electron Fermi surface play an ac tive role in forming the superconducting state in UPd2Al3. (C) 2000 Elsevie r Science B.V. All rights reserved.