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Phys. Rev. Lett. 100, 107002 (2008) [4 pages]

Identification of a New Form of Electron Coupling in the Bi2Sr2CaCu2O8 Superconductor by Laser-Based Angle-Resolved Photoemission Spectroscopy

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Wentao Zhang1, Guodong Liu1, Lin Zhao1, Haiyun Liu1, Jianqiao Meng1, Xiaoli Dong1, Wei Lu1, J. S. Wen2, Z. J. Xu2, G. D. Gu2, T. Sasagawa3, Guiling Wang4, Yong Zhu5, Hongbo Zhang4, Yong Zhou4, Xiaoyang Wang5, Zhongxian Zhao1, Chuangtian Chen5, Zuyan Xu4, and X. J. Zhou1,*
1National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
2Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
3Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama Kanagawa, Japan
4Laboratory for Optics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
5Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China

Received 19 December 2007; published 14 March 2008

Laser-based angle-resolved photoemission measurements with superhigh resolution have been carried out on an optimally doped Bi2Sr2CaCu2O8 high temperature superconductor. New high energy features at ∼115  meV and ∼150  meV, in addition to the prominent ∼70  meV one, are found to develop in the nodal electron self-energy in the superconducting state. These high energy features, which cannot be attributed to electron coupling with single phonon or magnetic resonance mode, point to the existence of a new form of electron coupling in high temperature superconductors.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.107002
DOI:
10.1103/PhysRevLett.100.107002
PACS:
74.72.Hs, 71.38.−k, 74.25.Jb, 79.60.−i

*Corresponding author.

XJZhou@aphy.iphy.ac.cn

 
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