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 (d_x²-y² and d_3z²-r²) channels are enhanced while the singlet (dxy,dxz,dyz) and triplet p-wave channels are suppressed. A unique feature of this pairing mechanism is its sensitivity to band structure and band filling.
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Scalapino et al. (1986) studied this question.
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