Abstract
We report on the temperature dependence of the impurity-induced resonant state in Zn-doped ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ investigated by scanning tunneling spectroscopy at $30\phantom{\rule{0.3em}{0ex}}\mathrm{mK}\ensuremath{\leqslant}T\ensuremath{\leqslant}52\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. It is known that the Zn impurity induces a sharp resonance peak in the tunneling spectrum at an energy close to the Fermi level. We observed that the resonance peak survives up to $52\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The peak broadens with increasing temperature, which is explained by the thermal effect. This result provides information for understanding the origin of the resonance peak.
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