Superconducting order parameter in heavily overdoped $Bi_2 Sr_2 Ca Cu_2 O_{8+\delta}$: a global quantitative analysis

TL;DR

This study analyzes the complex spectral lineshape in heavily overdoped Bi2212, revealing a coherent component linked to superfluid density, which serves as a direct measure of the high-temperature superconductor's order parameter.

Contribution

It provides a global quantitative analysis connecting spectral features with the superconducting order parameter across doping levels.

Findings

Coherent spectral component correlates with superfluid density.

The spectral lineshape serves as a direct measure of the order parameter.

Analysis spans the entire doping range of the material.

Abstract

A systematic analysis of the complex lineshape at $(\pi,0)$ of heavily overdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ is presented. We show that a coherent component in the quasi-particle excitation is correlated with the superfluid density throughout the entire doping range and suggest it is a direct measure of the order parameter of high temperature superconductors.