On the Phase Diagram of Superconducting U sub 1--x Th sub x Be sub 13

The inelastic scattering of conduction electrons on impurities can stimulate s-pairing superconductivity and at the same time suppress any non-s-pairing superconducting state. This may provide an explanation for the nonmonotonic behavior of the critical temperature T sub c (x) and thermodynamic and magnetic properties of the superconducting state in heavy fermionic compound U sub 1--x Th sub x Be sub 13 resulting from the combination of two superconducting phases corresponding to trivial and nontrivial representations of the cubic symmetry group.