Superconducting coherence peak in the electronic excitations of a single layer cuprate superconductor $Bi_2 Sr_{1.6} La_{0.4} Cu O_{6+\delta}$

TL;DR

This study uses angle-resolved photoemission spectroscopy to observe a superconducting coherence peak in a single-layer cuprate superconductor, revealing insights into its electronic excitations and their relation to spin excitations.

Contribution

First observation of a superconducting coherence peak in a single-layer cuprate, expanding understanding of electronic excitations in high-Tc superconductors.

Findings

Superconducting coherence peak observed in a single-layer cuprate.

Peak-dip separation is about 19 meV, smaller than in multi-layered compounds.

Peak-dip separation correlates with spin excitation energy scales.

Abstract

Angle resolved photoemission spectroscopy study is reported on a high quality optimally doped Bi2Sr1.6La0.4CuO6+delta high Tc superconductor. In the antinodal region with maximal d-wave gap, the symbolic superconducting coherence peak, which has been widely observed in multi-CuO2-layer cuprate superconductors, is unambiguously observed in a single layer system. The associated peak-dip separation is just about 19 meV, which is much smaller than its counterparts in multi-layered compounds, but correlates with the energy scales of spin excitations in single layer cuprates.