[2] Later experiments demonstrated that superconductivity in UPd2Al3 is magnetically mediated,[3] and UPd2Al3 therefore serves as a prime example for non-phonon-mediated superconductors.
[4][1] At that point, the Tc=2.0K of UPd2Al3 was the highest critical temperature amongst all known heavy-fermion superconductors, and this record would stand for 10 years until CeCoIn5 was discovered in 2001.
Indeed, for UPd2Al3 optical Drude behavior with an extremely low scattering rate was observed at microwave frequencies.
In contrast to many other unconventional superconductors, for UPd2Al3 there actually exists strong experimental evidence (namely from neutron scattering [3] and tunneling spectroscopy [9]) that superconductivity is magnetically mediated.
In the first years after the discovery of UPd2Al3 it was actively discussed whether its superconducting state can support a Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) phase, but this suggestion was later refuted.