Superconducting gap nodes in PrOs4Sb12PrOs4Sb12

We examine the superconducting gap nodes in crystals with tetrahedral (Th)(Th) symmetry. The (0,0,1)(0,0,1) phase of the three-dimensional order parameter in the triplet channel has nodes in the [001] directions. Following a second order phase transition to the state (0,i|η2|,|η1|)(0,i|η2|,|η1|), each node lifts away from the Fermi surface and splits into two deep dips. We discuss this scenario in the context of multiple superconducting phases in PrOs4Sb12PrOs4Sb12.