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25 April 2024

» arxiv » 0711.1706

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Evidence of Electron Coupling to High Energy Excitations in a High Temperature Superconductor
Wentao Zhang ; Guodong Liu ; Lin Zhao ; Haiyun Liu ; Jianqiao Meng ; Xiaoli Dong ; Wei Lu ; J. S. Wen ; 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 ;
Date:	12 Nov 2007
Abstract:	Super-high resolution angle-resolved photoemission measurements on an optimally-doped Bi$_2$Sr$_2$CaCu$_2$O$_8$ high temperature superconductor reveal a dramatic sensitivity of nodal excitations to temperature and superconductivity. The nodal photoemission spectra exhibit dramatic sharpening with decreasing temperature, with an obvious change in the scattering rate across T$_c$. New high energy features are found to develop at $sim$115meV and $sim$150meV, besides the prominent $sim$70 meV one, in the nodal electron self-energy in the superconducting state. These observations provide evidence that, in addition to coupling with low energy excitations like phonons or magnetic resonance mode, there are high-energy excitations involved in the electron coupling.
Source:	arXiv, 0711.1706
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