Abstract
Applying angle-resolved photoemission spectroscopy of high angular and energy resolution we have measured the electronic structure of single crystals of Bi2Sr2CaCu2O8 near the Fermi energy. Along the high symmetry direction ΓX a band is observed to disperse upwards and to cross the Fermi level, whose unoccupied part constitutes the hole-like carriers responsible for the superconductivity. From spectra along the Γ M direction we find evidence for an electron pocket around the M point. The measured band widths appear to be drastically reduced compared with band structure calculations indicating strong electronic correlation effects. From the observation of Fermi-Dirac-like cut-offs in the spectra due to band crossings through the Fermi level we can confirm the existence and, in particular, the shape of the Fermi surface as calculated by band structure calculations.
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Mante, G., Claessen, R., Buslaps, T. et al. Electronic structure and Fermi surface of Bi2Sr2CaCu2O8 . Z. Physik B - Condensed Matter 80, 181–185 (1990). https://doi.org/10.1007/BF01357500
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DOI: https://doi.org/10.1007/BF01357500