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Identification of a New Form of Electron Coupling in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:math>Superconductor by Laser-Based Angle-Resolved Photoemission Spectroscopy
Laser-based angle-resolved photoemission measurements with superhigh resolution have been carried out on an optimally doped ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8}$ high temperature superconductor. New high energy features at $\ensuremath{\sim}115\text{ }\text{ }\mathrm{meV}$ and $\ensuremath{\sim}150\text{ }\text{ }\mathrm{meV}$, in addition to the prominent $\ensuremath{\sim}70\text{ }\text{ }\mathrm{meV}$ one, are found to develop in the nodal electron self-energy in …