Identification of a New Form of Electron Coupling in Bi2Sr2CaCu2O8 Superconductor by Laser-Based Angle-Resolved Photoemission
Abstract
Laser-based angle-resolved photoemission measurements with super-high resolution have been carried out on an optimally-doped Bi2Sr2CaCu2O8 high temperature superconductor. New high energy features at 115 meV and 150 meV, besides the prominent 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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