Doping dependence of low-energy quasiparticle excitations in superconducting Bi2212

作者：Ino Akihiro^*; Anzai Hiroaki; Arita Masashi; Namatame Hirofumi; Taniguchi Masaki; Ishikado Motoyuki; Fujita Kazuhiro; Ishida Shigeyuki; Uchida Shinichi

来源：Nanoscale Research Letters, 2013, 8(1): 515.

DOI：10.1186/1556-276X-8-515

• High-T-c cuprate
• Bi2212
• ARPES
• Superconducting gap
• Effective mass
• Coupling strength

The doping-dependent evolution of the d-wave superconducting state is studied from the perspective of the angle-resolved photoemission spectra of a high-T (c) cuprate, Bi2Sr2CaCu2 O8+delta (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.

• 出版日期2013-12-5