Angle-resolved photoemission spectroscopy of tetragonal CuO: evidence for intralayer coupling between cupratelike sublattices.
We investigate by angle-resolved photoemission the electronic structure of in situ grown tetragonal CuO, a synthetic quasi-two-dimensional edge-sharing cuprate. We show that, in spite of the very different nature of the copper oxide layers, with twice as many Cu in the CuO layers of tetragonal CuO as compared to the CuO(2) layers of the high-T(c) cuprates, the low-energy electronic excitations are surprisingly similar, with a Zhang-Rice singlet dispersing on weakly coupled cupratelike sublattices. This system should thus be considered as a member of the high-T(c) cuprate family, with, however, interesting differences due to the intralayer coupling between the cupratelike sublattices.
Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and Advanced Light Source (ALS), Berkeley, California 94720, USA.
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S
Moser
Advanced Light Source (ALS), Berkeley, California 94720, USA.
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Moreschini
Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
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Yang
Advanced Light Source (ALS), Berkeley, California 94720, USA and Dipartimento di Ingegneria Meccanica, Università di Roma Tor Vergata, I-00133 Roma, Italy.
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Innocenti
Experimental Physics VI, Julius-Maximilian University of Würzburg, 97074 Würzburg, Germany.
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Fuchs
Experimental Physics VI, Julius-Maximilian University of Würzburg, 97074 Würzburg, Germany and ZAE Bayern, Am Hubland, 97074 Würzburg, Germany.
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Hansen
Advanced Light Source (ALS), Berkeley, California 94720, USA and Department of Physics, University of Seoul, Seoul 130-743, Korea.
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Chang
Advanced Light Source (ALS), Berkeley, California 94720, USA and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea and Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang 790-784, Korea.
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Kim
Advanced Light Source (ALS), Berkeley, California 94720, USA and Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
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Walter
Advanced Light Source (ALS), Berkeley, California 94720, USA.
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Bostwick
Advanced Light Source (ALS), Berkeley, California 94720, USA.
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E
Rotenberg
Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
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Mila
Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
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Grioni