Evidence for an Energy Scale for Quasiparticle Dispersion in Bi2Sr2CaCu2O8

Phys. Rev. Lett. 85, 2581 – Published 18 September 2000
P. V. Bogdanov, A. Lanzara, S. A. Kellar, X. J. Zhou, E. D. Lu, W. J. Zheng, G. Gu, J.-I. Shimoyama, K. Kishio, H. Ikeda, R. Yoshizaki, Z. Hussain, and Z. X. Shen

Abstract

Quasiparticle dispersion in Bi2Sr2CaCu2O8 is investigated with improved angular resolution as a function of temperature and doping. Unlike the linear dispersion predicted by the band calculation, the data show a sharp break in dispersion at 50±15 meV binding energy where the velocity changes by a factor of 2 or more. This change provides an energy scale in the quasiparticle self-energy. This break in dispersion is evident at and away from the d-wave node line, but the magnitude of the dispersion change decreases with temperature and with increasing doping.

DOI: http://dx.doi.org/10.1103/PhysRevLett.85.2581

  • Received 20 December 1999
  • Published in the issue dated 18 September 2000

© 2000 The American Physical Society

Authors & Affiliations

P. V. Bogdanov1, A. Lanzara1,2, S. A. Kellar1, X. J. Zhou1, E. D. Lu2, W. J. Zheng1, G. Gu3, J.-I. Shimoyama4, K. Kishio4, H. Ikeda5, R. Yoshizaki5, Z. Hussain2, and Z. X. Shen1

  • 1Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305
  • 2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
  • 3School of Physics, University of New South Wales, P.O. Box 1, Kensington, New South Wales, Australia 2033
  • 4Department of Applied Chemistry, University of Tokyo, Tokyo, 113-8656, Japan
  • 5Institute of Applied and Cryogenic Center, University of Tsukuba, Tsukuba, Ibaraki 305, Japan

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