Toward a Quantitative Understanding of Tunneling Spectra in BSCCO 2212

Quasiparticle tunneling spectra in BSCCO 2212 are analyzed from various junction types including STM, break junctions and intrinsic c-axis junctions. It is found that spectral features are consistent in terms of gap size, peak widths and location and strength of dip/hump features. Evidence for two types of pseudogap is presented. High temperature data (far above Tc) reveal a weak pseudogap not associated with superconductivity. However, this feature cannot account for the strong dip features found below Tc, which appear to result from strong coupling effects. The dip feature follows the doping dependence of the resonance spin excitation. All structures have been modeled by including band structure effects, d-wave superconductivity and pseudogap phenomena.