Analysis of the spectral function of Nd1.85Ce0.15CuO4, obtained by angle resolved photoemission spectroscopy

TL;DR

This study uses ARPES to analyze the spectral function of Nd1.85Ce0.15CuO4, revealing a renormalization feature ('kink') at 50-60 meV in both nodal and antinodal regions, similar to hole-doped cuprates.

Contribution

First observation of the 'kink' feature in both nodal and antinodal regions of electron-doped Nd1.85Ce0.15CuO4 using ARPES, expanding understanding of electron interactions in cuprates.

Findings

Kink observed at 50-60 meV in band dispersion.

Kink present in both nodal and antinodal regions.

Similarities with hole-doped cuprates observed.

Abstract

Samples of Nd(2-x)Ce(x)CuO(4), an electron-doped high temperature superconducting cuprate (HTSC), near optimal doping at x = 0.155 were measured via angle resolved photoemission (ARPES). We report a renormalization feature in the self energy ("kink") in the band dispersion at 50 - 60 meV present in nodal and antinodal cuts across the Fermi surface. Specifically, while the kink had previously only been seen in the antinodal region, it is now observed also in the nodal region, reminiscent of what has been observed in hole-doped cuprates.