Abstract
The interplay between charge density waves (CDW) and Bose condensation of local hole pairs in systems with strong electron-phonon interaction [1] is analysed on the basis of the negative U Hubbard Hamiltonian and local pair superconductor model. The Landau free energy functional with two competing order parameters is derived from microscopic considerations and the temperature-concentration (T - x) phase diagrams relevant for La2-xMxCuO4 (M = Ba, Ca, Sr) compounds are calculated.
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