Coexistence of charge-density waves and magnetic order

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Abstract
The ground state of a simple model which includes a periodic lattice distortion and a local electron-electron Coulomb interaction is studied. In the absence of magnetic order, the Coulomb repulsion tends to suppress the Peierls transition, but ferromagnetism may induce a periodic lattice distortion, giving rise to a phase in which the ferromagnetic order is modulated by a spin-density wave and coexists with a charge-density wave. The interplay of magnetism and lattice distortion depends strongly on the number of conduction electrons. The variation of the order parameters is also calculated as a function of the coupling parameters and of temperature.

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