UPdAl is a heavy-fermion superconductor with a hexagonal crystal structure and critical temperature T=2.0K that was discovered in 1991. Furthermore, UPdAl orders antiferromagnetically at T=14K, and UPdAl thus features the unusual behavior that this material, at temperatures below 2K, is simultaneously superconducting and magnetically ordered.
Later experiments demonstrated that superconductivity in UPdAl is magnetically mediated, and UPdAl therefore serves as a prime example for non-phonon-mediated superconductors.