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

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arxiv 0711.1706 v2 pith:JYPBN5NQ submitted 2007-11-12 cond-mat.supr-con cond-mat.str-el

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

Wentao Zhang , Guodong Liu , Lin Zhao , Haiyun Liu , Jianqiao Meng , Xiaoli Dong , Wei Lu , J. S. Wen
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Z. J. Xu G. D. Gu T. Sasagawa Guiling Wang Yong Zhu Hongbo Zhang Yong Zhou Xiaoyang Wang Zhongxian Zhao Chuangtian Chen Zuyan Xu X. J. Zhou
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classification cond-mat.supr-con cond-mat.str-el
keywords electronhighcouplingangle-resolvedenergyfeaturesformlaser-based
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Laser-based angle-resolved photoemission measurements with super-high resolution have been carried out on an optimally-doped Bi$_2$Sr$_2$CaCu$_2$O$_8$ high temperature superconductor. New high energy features at $\sim$115 meV and $\sim$150 meV, besides the prominent $\sim$70 meV one, are found to develop in the nodal electron self-energy in the superconducting state. These high energy features, which can not 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.

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