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Phys. Rev. B 78, 104513 (2008) [6 pages]

Appearance of universal metallic dispersion in a doped Mott insulator

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S. Sahrakorpi1, R. S. Markiewicz1, Hsin Lin1, M. Lindroos1,2, X. J. Zhou3,4, T. Yoshida5, W. L. Yang3,4, T. Kakeshita6, H. Eisaki3,6, S. Uchida6, Seiki Komiya7, Yoichi Ando8, F. Zhou9, Z. X. Zhao9, T. Sasagawa3,10, A. Fujimori5, Z. Hussain4, Z.-X. Shen3,4, and A. Bansil1
1Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
2Institute of Physics, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland
3Department of Physics, Department of Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
5Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
6Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
7Central Research Institute of Electric Power Industry, 2-11-1 Iwato-kita, Komae, Tokyo 201-8511, Japan
8Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
9National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
10MSL, Tokyo Institute of Technology, Kanagawa 226-8503, Japan

Received 19 July 2008; published 16 September 2008

We have investigated the dispersion renormalization Zdisp in La2−xSrxCuO4 over the wide doping range of x=0.03–0.30, for binding energies extending to several hundred meV’s. Strong correlation effects conspire in such a way that the system exhibits a local-density-approximation-like dispersion which essentially “undresses” (Zdisp→1) as the Mott insulator is approached. Our finding that the Mott insulator contains “nascent” or “preformed” metallic states with a vanishing spectral weight offers a challenge to existing theoretical scenarios for cuprates.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.104513
DOI:
10.1103/PhysRevB.78.104513
PACS:
71.18.+y, 79.60.−i, 74.72.Dn