Phys. Rev. Lett. 97, 227001 (2006) [4 pages]Strong and Complex Electron-Lattice Correlation in Optimally Doped Bi2Sr2CaCu2O8+δReceived 31 March 2005; revised 28 June 2006; published 27 November 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.227001
DOI:
10.1103/PhysRevLett.97.227001
PACS:
74.25.Jb, 71.38.−k, 74.72.−h, 79.60.−i
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