Abstract
The periodic lattice distortion BOW owing to the electron–lattice interaction and the spin density wave SDW owing to the electron–electron interaction in the two-dimensional Peierls–Hubbard model having a half-filled electronic band are studied numerically within the Hartree–Fock approximation. It is shown that the phase transition from the BOW to the SDW behaves as the first order phase transition when the on-site electron–electron interaction U is increased continuously. There is no region of U where the BOW and the SDW coexist as a uniform phase.
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