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Open Access Nano Express

Doping dependence of low-energy quasiparticle excitations in superconducting Bi2212

Akihiro Ino1*, Hiroaki Anzai2, Masashi Arita3, Hirofumi Namatame3, Masaki Taniguchi13, Motoyuki Ishikado456, Kazuhiro Fujita47, Shigeyuki Ishida45 and Shinichi Uchida4

Author Affiliations

1 Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan

2 Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan

3 Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan

4 Department of Physics, University of Tokyo, Tokyo 113-0033, Japan

5 National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan

6 Research Center for Neutron Science and Technology, CROSS, Tokai, Ibaraki 319-1106, Japan

7 Laboratory for Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA

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Nanoscale Research Letters 2013, 8:515  doi:10.1186/1556-276X-8-515

Published: 5 December 2013

Abstract

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

Keywords:
High-Tc cuprate; Bi2212; ARPES; Superconducting gap; Effective mass; Coupling strength; 74.25.Jb; 74.72.-h; 79.60.i