Local density of states around a magnetic impurity in high-Tc superconductors based on the t-J model

TL;DR

This study investigates the local density of states around magnetic impurities in high-Tc superconductors using a t-J model, revealing spin-dependent resonance peaks and their localization, with implications for scanning tunneling spectroscopy.

Contribution

It introduces a self-consistent approach combining Gutzwiller and Bogoliubov-de Gennes methods to analyze magnetic impurity effects in high-Tc superconductors.

Findings

Magnetic impurities produce two spin-dependent resonance peaks.

Resonance states are localized around the impurity.

Results align with scanning tunneling spectroscopy observations.

Abstract

The local density of states (LDOS) around a magnetic impurity in high-Tc superconductors is studied using the two-dimensional t-J model with a realistic band structure. The order parameters are determined in a self-consistent way within the Gutzwiller approximation and the Bogoliubov-de Gennes theory. In sharp contrast with the nonmagnetic impurity case, the LDOS near the magnetic impurity shows two resonance peaks reflecting the presence of spin-dependent resonance states. It is also shown that these resonance states are approximately localized around the impurity. The present results have an large implication on the scanning tunneling spectroscopy observation of Bi_{2}Sr_{2}Ca(Cu_{1-x}Ni[Zn]_{x})_{2}O_{8+delta}.