Abstract
We report polarization-dependent angle-resolved photoemission studies of single crystalline Ba2Cu3O4Cl2. This antiferromagnet adopts a layered body-centered tetragonal structure related to that of the cuprates, but with anextra copper site resulting in a plane with Cu3O4 stoichiometry. For the Γ-M direction of the Brillouin zone we observe a dispersive feature with a bandwidth of 400 ±80 meV, which approaches to within ∼ 0.9 eV of the Fermi level at (π/2,π/2). The magnitude of the observed dispersion and its polarization dependence are consistent with its origin as a purely antibonding combination of O2px,y and\(Cu3d_{x^2 - y^2 }\) atomic orbitals from the cuprate-like CuO2 sub-system, i.e. Zhang-Rice singlets.
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Schmelz, H.C., Haffner, S., Knupfer, M. et al. Polarization-dependent angle-resolved photoemission of the layered cuprate Ba2Cu3O4Cl2 . J Low Temp Phys 105, 341–346 (1996). https://doi.org/10.1007/BF00768409
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DOI: https://doi.org/10.1007/BF00768409