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Unmasking the nodal quasiparticle dynamics in cuprate superconductors using low-energy photoemission

T. Yamasaki·K. Yamazaki·A. Ino·M. Arita·H. Namatame·M. Taniguchi·A. Fujimori·Z. -X. Shen·M. Ishikado·S. Uchida
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Abstract

Nodal quasiparticles of Bi2Sr2CaCu2O8 have been studied by angle-resolved photoemission spectroscopy with high momentum and energy resolution. Low-energy tunable photons have enabled us to resolve a small nodal bilayer splitting, unmasking the intrinsic single-particle scattering rate. The nodal scattering rate is abruptly suppressed upon the superconducting transition, and shows a linear energy dependence at low energies, indicating the nontrivial effect of elastic scatterings on the quasiparticles. With increasing energy, the antibonding-band scattering rate becomes higher than the bonding one. The observations imply the character of the scatterers dominant at low energies.

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T. Yamasaki, K. Yamazaki, A. Ino, M. Arita, H. Namatame, M. Taniguchi, A. Fujimori, Z. -X. Shen, M. Ishikado, S. Uchida. 2007-05-03. Unmasking the nodal quasiparticle dynamics in cuprate superconductors using low-energy photoemission. https://doi.org/10.1103/physrevb.75.140513

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