Abstract
The interplay between phonon mediated and bare intrasite Coulomb electron-electron interactions is considered in the formation of superconducting and spin-density-wave ground states. A model Hamiltonian is solved in the mean-field approximation and the symmetry of its ground state analyzed in detail. The considered broken symmetries tend to destroy each other in general, but, in some cases, there is coexistence of superconductivity and spiral-spin-density-wave order in the ground state.
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