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Polarization-dependent angle-resolved photoemission spectroscopy measurements of Ba{sub 2}Cu {sub 3}O{sub 4}Cl{sub 2} indicate the presence of two different Zhang-Rice singlets in the two-dimensional Cu{sub 3}O{sub 4} plane of this insulating copper oxychloride. With the aid of model calculations, we show that one singlet is moving in the antiferromagnetically ordered cupratelike Cu{sub A}O {sub 2} subsystem and the other on the effectively paramagnetic sublattice formed by the extra Cu{sub B} atoms. The dispersion of the former is thus determined by the superexchange integral J{sub A} , and that of the latter by the hopping integral t{sub B} . Consequently, as far as the role of the magnetic background is concerned, the dispersion relation of a single hole in this system represents simultaneously both the low and very high doping limits of a cuprate plane in a single structure. {copyright} {ital 1997} {ital The American Physical Society}

physical review letters

Dispersion of a Hole in a Two-Dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Plane: A Tale of Two Singlets

Dispersion of a Hole in a Two-DimensionalCu3O4Plane: A Tale of Two Singlets