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Phys. Rev. Lett. 103, 087402 (2009) [4 pages]

X-Ray Absorption Spectra Reveal the Inapplicability of the Single-Band Hubbard Model to Overdoped Cuprate Superconductors

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D. C. Peets1,*, D. G. Hawthorn2, K. M. Shen3, Young-June Kim4, D. S. Ellis4, H. Zhang4, Seiki Komiya5, Yoichi Ando6, G. A. Sawatzky7, Ruixing Liang7, D. A. Bonn7, and W. N. Hardy7
1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
2Department of Physics & Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
3Department of Physics, Cornell University, Ithaca, New York 14853, USA
4Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada
5Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan
6Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
7Canadian Institute for Advanced Research, Canada, and Department of Physics & Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada

See Also: Erratum

Received 21 April 2009; published 19 August 2009

X-ray absorption spectra on the overdoped high-temperature superconductors Tl2Ba2CuO6+δ and La2-xSrxCuO4±δ reveal a striking departure in the electronic structure from that of the underdoped regime. The upper Hubbard band, identified with strong correlation effects, is not observed on the oxygen K edge, while the lowest-energy prepeak gains less intensity than expected above p∼0.21. This suggests a breakdown of the Zhang-Rice singlet approximation and a loss of correlation effects or a significant shift in the most fundamental parameters of the system, rendering single-band Hubbard models inapplicable. Such fundamental changes suggest that the overdoped regime may offer a distinct route to understanding in the cuprates.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.087402
DOI:
10.1103/PhysRevLett.103.087402
PACS:
78.70.Dm, 74.25.Jb, 74.72.Dn, 74.72.Jt

*dpeets@scphys.kyoto-u.ac.jp

See Also

Erratum: D. C. Peets, D. G. Hawthorn, K. M. Shen, Young-June Kim, D. S. Ellis, H. Zhang, Seiki Komiya, Yoichi Ando, G. A. Sawatzky, Ruixing Liang, D. A. Bonn, and W. N. Hardy, Erratum: X-Ray Absorption Spectra Reveal the Inapplicability of the Single-Band Hubbard Model to Overdoped Cuprate Superconductors [Phys. Rev. Lett. 103, 087402 (2009)], Phys. Rev. Lett. 104, 169903 (2010).

Comment: Philip Phillips and Mark Jarrell, Comment on “X-ray Absorption Spectra Reveal the Inapplicability of the Single-Band Hubbard Model to Overdoped Cuprate Superconductors”, Phys. Rev. Lett. 105, 199701 (2010).

 
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