Angle-resolved photoemission spectral function analysis of the electron-doped cuprate Nd 1.85 Ce 0.15 CuO 4

Using methods made possible by recent advances in photoemission technology, we perform an indepth line shape analysis of the angle-resolved photoemission spectra of the electron doped (n-type) cuprate superconductor ${\mathrm{Nd}}_{1.85}{\mathrm{Ce}}_{0.15}{\mathrm{CuO}}_{4}.$ Unlike for the p-type materials, we only observe weak mass renormalizations near 50--70 meV. This may be indicative of smaller electron-phonon coupling or due to the masking effects of other interactions that make the electron-phonon coupling harder to detect. This latter scenario may suggest limitations of the spectral function analysis in extracting electronic self-energies when some of the interactions are highly momentum dependent.