Abstract
The electronic structure of YBa 2Cu 3O 7 with a perfect lattice structure, and with one and two lattice defects at O(2), are investigated using cluster approximations. The clusters employed are (Cu 4O 2)(O 4Ba)(Cu 4O 4)Y and its derivatives, embedded in the ionic cage. Results strongly suggest that the lattice defect(s) at O(1) bring(s) the electron hole(s) to the CuO 2 plane.
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