Electronic structure of the trilayer cuprate superconductor Bi2Sr2Ca2Cu3O10+δ
D. L. Feng, A. Damascelli, K. M. Shen, N. Motoyama, D. H. Lu, H. Eisaki, K. Shimizu, J. -i. Shimoyama, K. Kishio, N. Kaneko, M. Greven, G. D. Gu, X. J. Zhou, C. Kim, F. Ronning, N. P. Armitage, Z. -X. Shen
Abstract
The low-energy electronic structure of the trilayer cuprate superconductor Bi2Sr2Ca2Cu3O10+δ near optimal doping 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 Tc for various optimally doped materials. This suggests that the higher Tc of the trilayer system should be attributed to parameters that simultaneously enhance phase stiffness and pairing strength.
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