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Angle Resolved Photoemission Spectroscopy (ARPES) measurements on high temperature superconductors, such as BiSrCaCuO, show three main components. These are a quasiparticle spectral peak that develops below the superconducting transition temperature T c , an accompanying broad background of secondary electrons and a dip feature beside the main quasiparticle peak. The broad background may originate from inelastic processes in which the photoelectron emits and absorbs spin fluctuations. Calculations of the quasiparticle spectral weight are presented incorporating these spin fluctuation mediated inelastic processes in which the development of the superconducting gap ∆ has been incorporated into the magnetic susceptibility χ(q, E). A dip feature develops below T c in the quasiparticle spectral weight due to the shifting of spin fluctuation spectral weight, Imχ(q, E), from low energies to energies greater than 2∆. These results predict that the dip feature in the ARPES spectrum in high temperature superconductors such as BiSrCaCuO, is evidence for the opening of a spin gap below T c .

Dependence of angle-resolved photoemission spectra of high-temperature superconductors on the spin-fluctuation susceptibility