An angle-resolved photoemission spectral function analysis of the   electron doped cuprate Nd_1.85Ce_0.15CuO_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 Nd_1.85Ce_0.15CuO_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. 
N.P. Armitage (UCLA, Stanford), D.H. Lu, C. Kim (SSRL), A. Damascelli,   K.M. Shen, F. Ronning, D.L. Feng, P. Bogdanov (Stan...