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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 16
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Phys. Rev. Lett. 98, 167003 (2007) [4 pages]

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

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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

Received 17 October 2006; published 18 April 2007

Photoemission studies show the presence of a high-energy anomaly in the observed band dispersion for two families of cuprate superconductors, Bi2Sr2CaCu2O8+δ and La2-xBaxCuO4. 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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.167003
DOI:
10.1103/PhysRevLett.98.167003
PACS:
74.25.−q, 74.72.−h, 74.78.Bz

*Email address: valla@bnl.gov

 
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