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Phys. Rev. Lett. 87, 177007 (2001) [4 pages]

Doping and Temperature Dependence of the Mass Enhancement Observed in the Cuprate Bi2Sr2CaCu2O8+δ

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P. D. Johnson1, T. Valla1, A. V. Fedorov1,*, Z. Yusof2, B. O. Wells2, Q. Li3, A. R. Moodenbaugh3, G. D. Gu4, N. Koshizuka5, C. Kendziora6, Sha Jian7, and D. G. Hinks7
1Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000
2Department of Physics, University of Connecticut, 2152 Hillside Road U-46, Storrs, Connecticut 06269
3Division of Materials Sciences, Brookhaven National Laboratory, Upton, New York 11973
4School of Physics, University of New South Wales, P.O. Box 1, Kensington, New South Wales, Australia 2033
5Superconductivity Research Laboratory, ISTEC, 10-13, Shinonome I-chrome, Koto-ku, Tokyo 135, Japan
6Materials Sciences Division, Naval Research Laboratory, Washington, D.C. 20375
7Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439

Received 14 February 2001; published 8 October 2001

High-resolution photoemission is used to study the electronic structure of the cuprate superconductor, Bi2Sr2CaCu2O8+δ, as a function of hole doping and temperature. A kink observed in the band dispersion in the nodal line in the superconducting state is associated with coupling to a resonant mode observed in neutron scattering. From the measured real part of the self-energy it is possible to extract a coupling constant which is largest in the underdoped regime, then decreasing continuously into the overdoped regime.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.177007
DOI:
10.1103/PhysRevLett.87.177007
PACS:
74.25.Jb, 74.72.Hs, 79.60.Bm

*Present address: Department of Physics, University of Colorado, Boulder, CO 80309-0390 and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.

 
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