Evidence for the validity of the pairing glue interpretation of high temperature superconductivity is presented using a modified Eliashberg analysis of experimental superconductor-insulator-superconductor (SIS) tunneling data in B 2 Sr 2 CaCu 2 O 8 (Bi2212) over a wide range of doping. This is accomplished by extracting detailed information on the diagonal and anomalous contributions to the quasiparticle selfenergy. In particular, a comparison of the imaginary part of the anomalous self-energy ImÈð!Þ and the pairing glue spectral function 2 Fð!Þ used in the model is consistent with Hubbard model simulations in the literature. In addition, the real part of the diagonal self-energy for optimal doped Bi2212 bears a strong resemblance to that obtained from photoemission experiments.
Results are presented for the temperature and frequency dependence of the real and imaginary parts of the diagonal self energy for a d-wave superconductor. An Eliashberg analysis, which has been successful in recent fitting of superconductor-insulator-superconductor (SIS) tunnel junction conductances for Bi2Sr2CaCu2O8 (Bi-2212), is extended to finite temperatures. The superconducting pairing mechanism is assumed to originate in the spin fluctuations of the copper-oxide planes, and is modelled by a function incorporating the spin resonance mode measured at an energy of approximately 40 meV for optimally doped Bi-2212. The effect of the temperature dependence of the spin resonance mode, measured in inelastic neutron scattering (INS), on the finite temperature self energies is investigated.
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