Photoemission studies show the presence of a high-energy anomaly in the observed band
dispersion for two families of cuprate superconductors, Bi 2 Sr 2 CaCu 2 O 8+ δ and La 2-x
Ba x CuO 4. The anomaly, which occurs at a binding energy of approximately 340 meV, is
found to be anisotropic and relatively weakly doping dependent. Scattering from short range
or nearest neighbor spin excitations is found to supply an adequate description of the
observed phenomena.

High-energy Kink Observed in the Electron Dispersion ofHigh-temperature Cuprate
Superconductors (Journal Article) | OSTI.GOV … GOV Journal Article: High-energy Kink
Observed in the Electron Dispersion ofHigh-temperature Cuprate Superconductors High-energy
Kink Observed in the Electron Dispersion ofHigh-temperature Cuprate Superconductors …