Article,

Identification of a New Form of Electron Coupling in the Bi$_2$Sr$_2$CaCu$_2$O$_8$ Superconductor by Laser-Based Angle-Resolved Photoemission Spectroscopy

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Phys. Rev. Lett., 100 (10): 107002 (2008)
DOI: 10.1103/PhysRevLett.100.107002

Abstract

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.

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