Unusual photoemission resonances of oxygen-dopant induced states in Bi$_{2}$Sr$_2$CaCu$_2$O$_{8+x}$

P. Richard; Z. -H. Pan; M. Neupane; A. V. Fedorov; T. Valla; P. D. Johnson; G. D. Gu; W. Ku; Z. Wang; H. Ding

doi:10.1103/PhysRevB.74.094512

paper

Unusual photoemission resonances of oxygen-dopant induced states in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + x}$

arXiv:cond-mat/0604521 · doi:10.1103/PhysRevB.74.094512

Abstract

We have performed an angular-resolved photoemission study of underdoped, optimally doped and overdoped Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + x}$ samples using a wide photon energy range (15 - 100 eV). We report a small and broad non-dispersive A $_{1 g}$ 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 Bi $_{2}$ Sr $_{2}$ CuO $_{6 + x}$ suggest a mixing of this local state with Cu via the apical oxygens.

4 pages, 4 figures

Unusual photoemission resonances of oxygen-dopant induced states in Bi2​Sr2​CaCu2​O8+x​

Abstract

Unusual photoemission resonances of oxygen-dopant induced states in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + x}$