Anisotropic Electron-Phonon Coupling Uncovered By Angle-Resolved   Photoemission
  Recently there has been an accumulation of experimental evidence in the high temperature superconductors suggesting the relevance of electron-phonon coupling in these materials. These findings challenge some well-held beliefs of what electron-phonon interactions can and cannot do. In this article we review evidence primarily from angle-resolved photoemission (ARPES) measurements which point out the importance of electronic coupling to certain phonon modes in the cuprates. 
T. P. Devereaux, T. Cuk, Z.-X. Shen, and N. Nagaosa