Abstract
One of the primary interests of heavy fermion superconductivity, besides possible unconventional order parameters, is the possibility of a non-phonon-mediated pairing mechanism. It has proved nevertheless very difficult to find an experimental probe of this hypothesis. The upper critical field, H c 2, of UBe 13 has revealed that this compound was in an extreme strong coupling regime, characterized by a strong coupling constant λ≈15. We present pressure measurements of H c2 in UBe 13, which probe the pressure dependence of λ. The main result is that in this compound, the pairing mechanism is also responsible for a large part of the mass renormalization and cannot arise from electron–phonon interactions. It will be discussed in the framework of the actual interpretations of the heavy masses in heavy fermion systems and UBe 13 will be contrasted with the other heavy fermion superconductors.
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