Effects of spin fluctuations on the tunneling spectroscopy in high-T-c superconductors - art. no. 172503

We investigate the effects of spin fluctuations on the tunneling spectra of the normal-metal-superconductor junction. In the high junction resistance limit, the dip/hump structure observed in ARPES data for the high T-c. supe rconductors is reproduced in a random-phase approximation treatment of the t-t'-J model. It is shown that the dip/hump structure weakens as doping inc reases as reflected in the data. In the other limit, we predict that the ze ro bias Andreev peak can coexist with the dip/hump structure. Furthermore, the c-axis tunneling spectra is found to be very similar to recent scanning runner microscope data once these fluctuations are included.