Evidence for an Energy Scale for Quasiparticle Dispersion in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>Bi</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>Sr</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>CaCu</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>O</mi></mrow><mrow><mn>8</mn></mrow></msub></mrow></math></span>

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; Z. X. Shen

doi:10.1103/PhysRevLett.85.2581

Evidence for an Energy Scale for Quasiparticle Dispersion in ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$

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

Phys. Rev. Lett. 85, 2581 – Published 18 September 2000

Abstract

Quasiparticle dispersion in ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$ 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 $50 \pm 15 meV$ 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.

Received 20 December 1999

DOI:https://doi.org/10.1103/PhysRevLett.85.2581

Authors & Affiliations

P. V. Bogdanov¹, A. Lanzara^1,2, 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