Abstract
We report an extensive angle-resolved photoemission spectroscopy study of a set of quickly dispersing electronic states near the G(0,0) point in Bi2Sr2CaCu22xNixOy (x,1%) single crystals at photon energy hn538 eV. These states cross the Fermi surface along both the G-M and G-Y directions and are outside the well-known large Fermi surface and satellite bands due to the superstructure in Bi2212. The electronic states have a strong nonmonotonic photon energy dependence and demonstrate a symmetry different from the symmetry of the Cu-O plane. The possible origin of these electronic states is discussed. In addition, we show that the whole Fermi-surface topology in Bi2212 is photon energy dependent.
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