Abstract
High-resolution angle-resolved photoemission spectroscopy has been performed on Zn-substituted ${\mathrm{La}}_{1.85}{\mathrm{Sr}}_{0.15}\mathrm{Cu}{\mathrm{O}}_{4}$ to study the impurity effect on the electronic structure near the Fermi level. Upon Zn substitution, the kink in the band dispersion at $20\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ and the coherence peak in the off-nodal region in the superconducting state are significantly weakened and, at the same time, additional electronic states systematically evolve inside the superconducting gap. The suppression of the kink with Zn substitution shows a good correspondence to the low-energy incommensurate magnetic excitations.
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