Strong and Complex Electron-Lattice Correlation in Optimally Doped Bi2Sr2CaCu2O8+δ

G.-H. Gweon, S. Y. Zhou, M. C. Watson, T. Sasagawa, H. Takagi, and A. Lanzara
Phys. Rev. Lett. 97, 227001 – Published 27 November 2006

Abstract

We discuss the nature of electron-lattice interaction in optimally doped Bi2Sr2CaCu2O8+δ samples, using the isotope effect (IE) in angle resolved photoemission spectroscopy (ARPES) data. The IE in the ARPES linewidth and the IE in the ARPES dispersion are both quite large, implying a strong electron-lattice correlation. The strength of the electron-lattice interaction is “intermediate,” i.e., stronger than the Migdal-Eliashberg regime but weaker than the small polaron regime, requiring a more general picture of the ARPES kink than the commonly used Migdal-Eliashberg picture. The two IEs also imply a complex interaction, due to their strong momentum dependence and their differing sign behaviors. In sum, we propose an intermediate-strength coupling of electrons to localized lattice vibrations via charge density fluctuations.

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  • Received 31 March 2005

DOI:https://doi.org/10.1103/PhysRevLett.97.227001

©2006 American Physical Society

Authors & Affiliations

G.-H. Gweon1,6, S. Y. Zhou1, M. C. Watson1, T. Sasagawa2,3, H. Takagi2,3,4, and A. Lanzara1,5

  • 1Department of Physics, University of California, Berkeley, California 94720, USA
  • 2Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
  • 3CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan
  • 4RIKEN (The Institute of Physical and Chemical Research), Wako 351-0198, Japan
  • 5Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 6Department of Physics, University of California, Santa Cruz, California 95064, USA

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Issue

Vol. 97, Iss. 22 — 1 December 2006

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