Abstract
We present a simple model to account for the High-T c perovskite superconductors. The superconducting mechanism is purely electronic and comes from local Hubbard correlations. The model comprises a Hubbard model for the Copper sites with a single particle Oxygen band between the two Copper Hubbard bands. The electrons move only between nearest neighbour atoms which are of different types. Using two very different approximation schemes, one related to ‘Slave-Boson’ mean field theory and the other based on an exact local Fermion transformation, we show the possibility of Copper-Oxygen or a mixture of Copper-Oxygen and Oxygen-Oxygen pairing. We believe that the most promising situation for superconductivity is with the Oxygen band over half-filled and closer in energy to the lower Hubbard band.
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Long, M.W. Correlation mediated superconductivity in a “HighT c ” model. Z. Physik B - Condensed Matter 69, 409–425 (1988). https://doi.org/10.1007/BF01312501
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DOI: https://doi.org/10.1007/BF01312501