  Local density of states and quasiparticle interference phenomena of
Co/Sb(111) were investigated by scanning tunneling spectroscopy. A sharp peak
observed near the Fermi energy is interpreted as a fingerprint of the
conventional Kondo resonance with the Kondo temperature of K. Moreover, by
identifying the interference wavevectors, only the scattering channels relating
to backscattering confinements are observed for surfaces with and without the
Co deposition. It reveals that the Kondo effect fully screens the magnetic
impurities and thereby suppresses the backscattering of the topological surface
state.
