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The electronic structure of the surface of the superconductor YBa2Cu3O7

The electronic structures of several clusters in different Cu-O planes considered as possible surfaces in the superconductor YBa2Cu3O7 are studied within the framework of local density theory. Self-consistent solutions are obtained using the discrete variational and Xalpha cluster method. Several peaks in the UPS are identified by comparing the calculated values of the density of states with the experimental data. The surface electronic structure of the material is also discussed.