title: Quasiparticles in the superconducting state of Bi(2)Sr(2)CaCu(2)O(8+delta)
abstract: Recent improvements in momentum resolution lead to qualitatively new angle-resolved photoemission spectroscopy results on the spectra of Bi(2)Sr(2)CaCu(2)O(8+delta) (Bi2212) along the (pi,pi) direction, where there is a node in the superconducting gap. We now see the intrinsic line shape, which indicates the presence of true quasiparticles at all Fermi momenta in the superconducting state, and lack thereof in the normal state. The region of momentum space probed here is relevant for charge transport, motivating a comparison of our results to conductivity measurements by infrared reflectivity.
authors.affiliation: Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607 and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.initials: A
authors.lastname: Kaminski
authors.initials: J
authors.lastname: Mesot
authors.initials: H
authors.lastname: Fretwell
authors.initials: JC
authors.lastname: Campuzano
authors.initials: MR
authors.lastname: Norman
authors.initials: M
authors.lastname: Randeria
authors.initials: H
authors.lastname: Ding
authors.initials: T
authors.lastname: Sato
authors.initials: T
authors.lastname: Takahashi
authors.initials: T
authors.lastname: Mochiku
authors.initials: K
authors.lastname: Kadowaki
authors.initials: H
authors.lastname: Hoechst