Time-Reversal symmetry violation and the structure of the superconducting order parameter of PrOs4Sb12

The antisymmetric two-electron wave functions corresponding to the symmetry of Cooper pairs are constructed for the symmetry group T _h of the PrOs₄Sb₁₂ superconductor and its subgroup D _2h . The dependence of the structure of these functions (the presence of point nodes) on the group of the wave vector and the multiplicity is investigated. The theoretical nodal structure obtained for the two-electron wave functions makes it possible to explain the experimentally observed structure of the superconducting order parameter of the PrOs₄Sb₁₂ compound (the presence of two phases with different nodal structures) by the time-reversal symmetry violation.