Abstract
The paramagnon theory in superfluid 3 He is reconsidered. First, using the perturbation expansion up to the third order in the long range interaction related to the hard-core potential of 3 He , we evaluate the Gor'kov–Éliashberg equation. It is suggested that suppression of the density fluctuation in the high density leads to the p-wave triplet pairing. Second, we discuss the vertex correction for the paramagnon theory. Although the large mass enhancement in one paramagnon process at the nearly ferromagnetic quantum critical point drastically reduces the transition temperature, the vertex corrections suppress the mass enhancement, and stabilize the p-wave triplet pairing.
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