Fermi Surface and Quasiparticle Excitations of overdoped Tl2Ba2CuO6+d by   ARPES
  The electronic structure of the high-T_c superconductor Tl2Ba2CuO6+d is studied by ARPES. For a very overdoped Tc=30K sample, the Fermi surface consists of a single large hole pocket centered at (pi,pi) and is approaching a topological transition. Although a superconducting gap with d_x^2-y^2 symmetry is tentatively identified, the quasiparticle evolution with momentum and binding energy exhibits a marked departure from the behavior observed in under and optimally doped cuprates. The relevance of these findings to scattering, many-body, and quantum-critical phenomena is discussed. 
M. Plate, J.D.F. Mottershead, I.S. Elfimov, D.C. Peets, Ruixing Liang,   D.A. Bonn, W.N. Hardy, S. Chiuzbaian, M. Falub, M. ...