Dispersion of a Hole in a Two-DimensionalCu3O4Plane: A Tale of Two Singlets
| Autor: | Mark S. Golden, Heike C. Schmelz, Martin Knupfer, Stefan Haffner, Gernot Krabbes, Jörg Fink, Victor Yu. Yushankhai, Helge Rosner, Roland Hayn, Andreas Müller, Gerd Reichardt |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 78:4107-4110 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.78.4107 |
| Popis: | 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} |
| Databáze: | OpenAIRE |
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