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Phys. Rev. B 75, 075115 (2007) [5 pages]

Angle-resolved photoemission studies of lattice polaron formation in the cuprate Ca2CuO2Cl2

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K. M. Shen1,2, F. Ronning1,*, W. Meevasana1, D. H. Lu1, N. J. C. Ingle1,2, F. Baumberger1,†, W. S. Lee1, L. L. Miller3, Y. Kohsaka4, M. Azuma5, M. Takano5, H. Takagi4,6, and Z.-X. Shen1
1Department of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
2Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
3Department of Chemistry, University of Oregon, Eugene, Oregon 97403, USA
4Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
5Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
6RIKEN, The Institute for Physical and Chemical Research, Wako 351-0198, Japan

Received 24 January 2007; published 22 February 2007

To elucidate the nature of the single-particle excitations in the undoped parent cuprates, we have performed a detailed study of Ca2CuO2Cl2 using photoemission spectroscopy. The photoemission line shapes of the lower Hubbard band are found to be well-described by a polaron model. By comparing the line shape and temperature dependence of the lower Hubbard band with additional O 2p and Ca 3p states, we conclude that the dominant broadening mechanism arises from the interaction between the photohole and the lattice. The strength of this interaction was observed to be strongly anisotropic and may have important implications for the momentum dependence of the first doped hole states.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.075115
DOI:
10.1103/PhysRevB.75.075115
PACS:
74.25.Jb, 74.20.Rp, 74.72.−h, 79.60.−i

*Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

†Present address: School of Physics and Astronomy, University of St. Andrews, Scotland.

 
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