Polarization-dependent angle-resolved photoemission of the layered cuprate Ba{sub 2}Cu{sub 3}O{sub 4}Cl{sub 2}

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00768409· OSTI ID:457187

Schmelz, H C; Haffner, S; Krabbes, G ^[1]

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1. Institut fuer Festkoerper- und Werkstofforschung Dresden (Germany); and others

The authors report polarization-dependent angle-resolved photoemission studies of single crystalline Ba{sub 2}Cu{sub 3}O{sub 4}Cl{sub 2}. This antiferromagnet adopts a layered body-centered tetragonal structure related to that of the cuprates, but with an extra copper site resulting in a plane with Cu{sub 3}O{sub 4} stoichiometry. For the {Gamma}-M direction of the Brillouin zone the authors observe a dispersive feature with a bandwidth of 400 {+-} 80 meV, which approaches to within {approximately}0.9 eV of the Fermi level at ({pi}/2, {pi}/2). The magnitude of the observed dispersion and its polarization dependence are consistent with its origin as a purely antibonding combination of O2p{sub x,y} and Cu3d{sub x{sup 2}{minus}y{sup 2}} atomic orbitals from the cuprate-like CuO{sub 2} sub-system, i.e. Zhang-Rice singlets.

• Sponsoring Organization: USDOE
• OSTI ID: 457187
• Report Number(s): CONF-960808--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
BARIUM OXIDES
COPPER CHLORIDES
COPPER OXIDES
ELECTRONIC STRUCTURE
PHOTOEMISSION