Abstract
We report measurements under pressure of the upper critical field of the heavy-fermion superconductor UBe 13. An interpretation in the framework of a simple strong coupling model is achieved consistently with only one arbitrary parameter: the strong coupling constant λ. We find that UBe 13 is in an extreme strong coupling regime and that the variation of λ with pressure explains the pressure dependence of the thermodynamic properties of both the normal and superconducting phases, revealing a strong interplay between the mass renormalization and the pairing mechanism.
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