Anomalous high-energy dispersion in angle-resolved photoemission spectra from the insulating cuprate Ca2CuO2Cl2

F. Ronning, K. M. Shen, N. P. Armitage, A. Damascelli, D. H. Lu, Z.-X. Shen, L. L. Miller, and C. Kim
Phys. Rev. B 71, 094518 – Published 30 March 2005

Abstract

Angle-resolved photoelectron spectroscopic measurements have been performed on an insulating cuprate Ca2CuO2Cl2. High-resolution data taken along the Γ to the (π,π) cut show an additional dispersive feature that merges with the known dispersion of the lowest binding energy feature, which follows the usual strongly renormalized dispersion of 0.35eV. This higher energy part reveals a dispersion that is very close to the unrenormalized band predicted by band theory. A transfer of spectral weight from the low energy feature to the high energy feature is observed as the Γ point is approached. By comparing with theoretical calculations the high energy feature observed here demonstrates that the incoherent portion of the spectral function has significant structure in momentum space due to the presence of various energy scales.

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  • Received 8 November 2004

DOI:https://doi.org/10.1103/PhysRevB.71.094518

©2005 American Physical Society

Authors & Affiliations

F. Ronning1,2, K. M. Shen1, N. P. Armitage1,*, A. Damascelli1,†, D. H. Lu1, Z.-X. Shen1, L. L. Miller3, and C. Kim1,4

  • 1Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
  • 2MST-10 Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3Chemistry Department, University of Oregon, Eugene, Oregon 97404, USA
  • 4Institute of Physics and Applied Physics, Yonsei University, Seoul, Korea

  • *Present address: Dept. de Physique de la Matière Condense, Université de Genève, Switzerland.
  • Present address: Dept. of Physics and Astronomy, University of British Columbia, Vancouver, Canada, V6T 1Z1.

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Vol. 71, Iss. 9 — 1 March 2005

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