Quasiparticle liquid in the highly overdoped Bi2Sr2CaCu2O8+δ -: art. no. 167006

Results from the study of a highly overdoped (OD) Bi2Sr 2CaCu2O8+delta with a T-c=51 K using angle-resolved photoemission spectroscopy are presented. We observe a sharp peak in the spectra near (pi, 0) that persists well above T-c, a nodal self-energy which approaches that seen for the Mo(110) surface state, and a more k -independent line shape at the Fermi surface than the lower-doped cuprates. This allows for a realistic comparison of the lifetime values to the experimental resistivity measurements. These observations point to the validity of the quasiparticle picture for the OD even in the normal state.