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The nearly half-filled Hubbard model with strong on-site repulsion is used as a model for the recently discovered copper oxide high-temperature superconductors. The onset of superconductivity upon doping the half-filled lattice of La2CuO4 is explained in terms of the Bose-Einstein condensation of holes of effective mass O(me). These holes move freely over an antiferromagnetic background. The mechanism is very different from the BCS mechanism. A fit to data is obtained by adjusting the interplane hopping amplitude, which turns out to be extremely small, though necessary.
©1987 The American Physical Society.
PACS: 74.20.-z 75.10.Jm 75.10.Lp
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