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In order to explore how superconductivity arises when charge fluctuations andspin fluctuations coexist, we have obtained a phase diagram against theoff-site repulsion V and band filling n for the extended, repulsive Hubbardmodel on the square lattice with the fluctuation exchange approximation. Wehave found the existence of (i) a transition between dxy and dx2-y2 pairingsymmetries, (ii) f-pairing in between the dx2-y2 and CDW phases forintermediate 0.5<n<1.0 and large V, and (iii) for anisotropic cases the pairingsymmetry changing, in agreement with a previously proposed ``generic phasediagram", as d -> f -> s when V (hence the charge fluctuations) are increased.All these are consequences of the structure in the charge and spinsusceptibilities, which have peaks habitating at the common or segregatedpositions in k space.Comment: 6 pages, 8 figure

physical review. b, condensed matter and materials physics

Phase diagram of the two-dimensional extended Hubbard model: Phase transitions between different pairing symmetries when charge and spin fluctuations coexist