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Phys. Rev. Lett. 93, 117003 (2004) [4 pages]

Coupling of the B1g Phonon to the Antinodal Electronic States of Bi2Sr2Ca0.92Y0.08Cu2O8+δ

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T. Cuk1, F. Baumberger1, D. H. Lu1, N. Ingle1, X. J. Zhou1, H. Eisaki2,1, N. Kaneko1, Z. Hussain3, T. P. Devereaux4, N. Nagaosa5, and Z.-X. Shen1,6
1Departments of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
2Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568, Japan
3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
4Department of Physics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
5CREST, Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
6Physics Institute, University of Zurich, Zurich, CH-8057, Switerland

Received 25 February 2004; published 10 September 2004

Angle-resolved photoemission spectroscopy on optimally doped Bi2Sr2Ca0.92Y0.08Cu2O8+δ uncovers a coupling of the electronic bands to a 40 meV mode in an extended k-space region away from the nodal direction, leading to a new interpretation of the strong renormalization of the electronic structure seen in Bi2212. Phenomenological agreements with neutron and Raman experiments suggest that this mode is the B1g oxygen bond-buckling phonon. A theoretical calculation based on this assignment reproduces the electronic renormalization seen in the data.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.117003
DOI:
10.1103/PhysRevLett.93.117003
PACS:
74.72.Hs, 74.25.Jb, 74.25.Kc, 79.60.–i
 
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