Anisotropic scattering rate in Fe substituted Bi2212

TL;DR

This study uses ARPES to investigate how Fe substitution affects the electronic structure of Bi2212, revealing anisotropic scattering rate enhancements without altering the superconducting gap's momentum dependence.

Contribution

It provides new insights into how Fe substitution uniquely influences scattering rates and coherence in Bi2212, contrasting with Zn effects.

Findings

Fe substitution causes anisotropic scattering rate increase.

Superconducting gap momentum dependence remains unchanged.

Fe suppresses T_c by reducing coherence around anti-nodes.

Abstract

We measured the electronic structure of Fe substituted Bi2212 using Angle Resolved Photoemission Spectroscopy (ARPES). We find that the substitution does not change the momentum dependence of the superconducting gap but induces a very anisotropic enhancement of the scattering rate. A comparison of the effect of Fe substitution to that of Zn substitution suggests that the Fe reduces T$_c$ so effectively because it supresses very strongly the coherence weight around the anti-nodes.