Phase-transition splitting caused in exotic superconductors by impurities
Volovik G. E. , Khmel'nitskii D. E.
The observed splitting of the superconducting transition in\Ji_x Thx Be13 is explained on the basis that with increasing temperature the thorium impurity initially disrupts the orientational long-range order characteristic of exotic superconductors (G. E. Volovik and L. P. Gor'kov, Pis'ma Zh. Eksp. Teor. Fiz. 39,550 (1984) [JETP Lett. 39,550 (1984)] j. The superconducting state is destroyed during a second transition.