Theoretical consideration on triplet superconductivity in UPt3 and Sr2RuO4

Two representative superconductors, UPt3 and Sr2RuO4, are comparatively stu died on the basis of a general symmetry argument. The existing experimental data set for both systems strongly and commonly points to a triplet pairin g. For the former, heavy fermion material, UPt3, a non-unitary bipolar stat e is the most possible candidate, whereas for the latter system, Sr2RuO4, d etermination of a precise pairing symmetry class, either unitary or non-uni tary, is debated.