  We compare predictions of the mean-field theory of superconductivity for
nearly antiferromagnetic and nearly ferromagnetic metals for cubic and
tetragonal lattices. The calculations are based on the parametrization of an
effective interaction arising from the exchange of magnetic fluctuations and
assume that a single band is relevant for superconductivity. The results show
that for comparable model parameters, the robustness of magnetic pairing
increases gradually as one goes from a cubic structure to a more and more
anisotropic tetragonal structure either on the border of antiferromagnetism or
ferromagnetism.
