Photoemission studies of self-energy effects in cuprate superconductors

Recent instrumentation developments in photoemission are providing new insi ghts into the physics of complex materials. With increased energy and momen tum resolution, it has become possible to examine in detail different contr ibutions to the self-energy or inverse lifetime of the photohole created in the photoexcitation process. In studies of a metallic system such as Mo it is possible to isolate and identify the different contributions to the qua si-particle lifetime including electron-electron, electron-phonon and elect ron-impurity scattering. In contrast, studies of the high T-c superconducto r, Bi2Sr2CaCu2O8+delta, show that the material at optimal doping behaves li ke a non-Fermi liquid rather a Fermi liquid. (C) 2001 Elsevier Science B.V. All rights reserved.