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Unoccupied electronic structure of single-crystal La2CuO4.

Single crystals of lanthanum cuprate have been studied using k-resolved inverse photoemission. The predicted dispersion of the Cu 3d--O2p-derived band through the Fermi level is not observed and this may influence models for high-temperature superconductivity based on band-structure calculations. In addition, resonant inverse photoemission of the lanthanum-derived features is also observed at the plasmon frequencies.