Electronic Structure of the Trilayer Cuprate Superconductor Bi2Sr2Ca2Cu3O10+δ

Abstract

The low-energy electronic structure of the nearly optimally doped trilayer cuprate superconductor ${\mathrm{Bi}}_2{\mathrm{Sr}}_2{\mathrm{Ca}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{10+\delta }$ is investigated by angle-resolved photoemission spectroscopy. The normal state quasiparticle dispersion and Fermi surface and the superconducting $d$-wave gap and coherence peak are observed and compared with those of single- and bilayer systems. We find that both the superconducting gap magnitude and the relative coherence-peak intensity scale linearly with $T_c$ for various optimally doped materials.