Changes in the self-energy and d-wave pairing strength with doping in overdoped La(2-x)Sr(x)CuO4

TL;DR

This study investigates how doping affects the electron self-energy and d-wave pairing strength in overdoped La$_{2-x}$Sr$_x$CuO$_4$, revealing that spin-fluctuation interactions align with experimental ARPES data showing minimal changes.

Contribution

The paper demonstrates that a spin-fluctuation interaction model explains the observed doping-dependent behavior of self-energy and pairing in overdoped cuprates.

Findings

Small changes in near nodal electron self energy with doping

Spin-fluctuation interaction consistent with experimental results

Constraints on electron-electron interaction structure

Abstract

Angle resolved photoemission spectroscopy (ARPES) studies of the overdoped cuprate superconductor La$_{2-x}$Sr$_x$CuO$_4$ find only small changes in the near nodal electron self energy over a spectral range of several hundred meV as the doping increases from x=0.2 to x=0.3 and the superconducting transition temperature T_c decreases from 32K to 0K. These measurements put constraints on the structure of the electron-electron interaction. Here we show that a spin-fluctuation interaction leads to behavior which is consistent with these experimental results.