Abstract
We have performed high-resolution angle-resolved photoemission spectroscopy on hole-doped high- T c cuprate superconductors (HTSCs) to study many-body interaction and the universality of low-energy excitation gap. In Bi 2Sr 2CaCu 2O 8 (Bi2212), we observed a kink in the dispersion in the off-nodal region in the superconducting state, which remarkably weakens on impurity substitution. We also find that the appearance of the kink in the off-nodal region is a common feature of Bi2212 and La 1.85Sr 0.15CuO 4 (LSCO), while the energy scale is remarkably different between two compounds (70 and 20 meV). We discuss universality of the kink in dispersion in the hole-doped HTSCs in terms of the coupling of electrons with spin fluctuations.
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