Abstract
Superconductivity of triplet bipolarons has been investigated in a phase analogous to the superfluid A-phase of 3He by use of the broken-symmetry Hartree approximation. The transition temperature T c, the chemical potential and the order-parameters have been obtained, and the specific heat and the thermodynamic critical field have also been calculated. It has been found that there exist two energy gaps in the superconducting state. In the normal phase there also exists a gap, whose magnitude is consistent with the recent experimental evidence of the heavy-fermion superconductor (HFS), UPt 3. Temperature dependence of the critical field of another HFS UBe 13, which is not yet understood, can also be qualitatively accounted for by this model. These show the possibility that triplet bipolarons might be formed in the HFSs.
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