Unusual photoemission resonances of oxygen-dopant induced states in Bi2Sr2CaCu2O8+x
P. Richard, Z. -H. Pan, M. Neupane, A. V. Fedorov, T. Valla, P. D. Johnson, G. D. Gu, W. Ku, Z. Wang, H. Ding
Abstract
We have performed an angular-resolved photoemission study of underdoped, optimally doped and overdoped Bi2Sr2CaCu2O8+x samples using a wide photon energy range (15 - 100 eV). We report a small and broad non-dispersive A1g peak in the energy distribution curves whose intensity scales with doping. We attribute it to a local impurity state similar to the one observed recently by scanning tunneling spectroscopy and identified as the oxygen dopants. Detailed analysis of the resonance profile and comparison with the single-layered Bi2Sr2CuO6+x suggest a mixing of this local state with Cu via the apical oxygens.
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