High-Energy Kink Observed in the Electron Dispersion of High-Temperature Cuprate Superconductors

T. Valla, T. E. Kidd, W.-G. Yin, G. D. Gu, P. D. Johnson, Z.-H. Pan, and A. V. Fedorov
Phys. Rev. Lett. 98, 167003 – Published 18 April 2007

Abstract

Photoemission studies show the presence of a high-energy anomaly in the observed band dispersion for two families of cuprate superconductors, Bi2Sr2CaCu2O8+δ and La2xBaxCuO4. The anomaly, which occurs at a binding energy of approximately 340 meV, is found to be anisotropic and relatively weakly doping dependent. Scattering from short range or nearest neighbor spin excitations is found to supply an adequate description of the observed phenomena.

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  • Received 17 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.167003

©2007 American Physical Society

Authors & Affiliations

T. Valla1,*, T. E. Kidd1,2, W.-G. Yin1, G. D. Gu1, P. D. Johnson1, Z.-H. Pan3, and A. V. Fedorov3

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Physics Department, University of Northern Iowa, Cedar Falls, Iowa 50614-0150, USA
  • 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *Email address: valla@bnl.gov

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Issue

Vol. 98, Iss. 16 — 20 April 2007

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