Temperature dependence of the impurity-induced resonant state in Zn-doped Bi_2Sr_2CaCu_2O$_{8+\delta}$ by Scanning Tunneling Spectroscopy

TL;DR

This study investigates how the impurity-induced resonant state in Zn-doped Bi-2212 superconductor evolves with temperature, revealing that the resonance persists up to 52 K and broadens due to thermal effects, aiding understanding of its origin.

Contribution

It provides new insights into the temperature behavior of impurity resonances in high-Tc cuprates using scanning tunneling spectroscopy.

Findings

Resonant peak persists up to 52 K.

Peak broadens with increasing temperature.

Thermal effects explain peak broadening.

Abstract

We report on the temperature dependence of the impurity-induced resonant state in Zn-doped Bi_2Sr_2CaCu_2O$_{8+\delta}$ by scanning tunneling spectroscopy at 30 mK < T < 52 K. It is known that a Zn impurity induces a sharp resonant peak in tunnel spectrum at an energy close to the Fermi level. We observed that the resonant peak survives up to 52 K. The peak broadens with increasing temperature, which is explained by the thermal effect. This result provides information to understand the origin of the resonant peak.