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We investigate the three-dimensional Hubbard model and show that paramagnon exchange near a spin-density-wave instability gives rise to a strong singlet d-wave pairing interaction. For a cubic band the singlet (dₗ^{2-y^2} and d₃ₙ^{2-r^2}) channels are enhanced while the singlet (dₗₘ, dₗₙ, dₘₙ) and triplet p-wave channels are suppressed. A unique feature of this pairing mechanism is its sensitivity to band structure and band filling.
Scalapino et al. (Mon,) studied this question.
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