title: Doping dependence of low-energy quasiparticle excitations in superconducting Bi2212.
abstract: : The doping-dependent evolution of the d-wave superconducting state is studied from the perspective of the angle-resolved photoemission spectra of a high-Tc cuprate, Bi2Sr2CaCu2 O8+δ (Bi2212). The anisotropic evolution of the energy gap for Bogoliubov quasiparticles is parametrized by critical temperature and superfluid density. The renormalization of nodal quasiparticles is evaluated in terms of mass enhancement spectra. These quantities shed light on the strong coupling nature of electron pairing and the impact of forward elastic or inelastic scatterings. We suggest that the quasiparticle excitations in the superconducting cuprates are profoundly affected by doping-dependent screening.
authors: Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan. ino@hiroshima-u.ac.jp.
authors: Akihiro
authors: A
authors: Ino
authors: Hiroaki
authors: H
authors: Anzai
authors: Masashi
authors: M
authors: Arita
authors: Hirofumi
authors: H
authors: Namatame
authors: Masaki
authors: M
authors: Taniguchi
authors: Motoyuki
authors: M
authors: Ishikado
authors: Kazuhiro
authors: K
authors: Fujita
authors: Shigeyuki
authors: S
authors: Ishida
authors: Shinichi
authors: S
authors: Uchida