Contrasting electron-phonon interaction between electron- and hole-doped cuprates

TL;DR

This study uses angle-resolved photoemission spectroscopy to compare electron-phonon interactions in electron- and hole-doped cuprates, revealing a strong momentum-dependent coupling linked to antiferromagnetic fluctuations in electron-doped materials.

Contribution

It uncovers the contrasting electron-phonon interaction characteristics between electron- and hole-doped cuprates, highlighting their relationship with antiferromagnetic order.

Findings

Strong momentum-dependent electron-phonon coupling in electron-doped cuprates.

Contrast in mode coupling behavior between electron- and hole-doped cuprates.

Link between electron-phonon interaction and antiferromagnetic fluctuations.

Abstract

Spin- and charge-lattice interactions are potential key factors in the microscopic mechanism of high-temperature superconductivity in cuprates. Although both interactions can dramatically shape the low-energy electronic structure, their phenomenological roles in superconductivity are usually investigated independently. Employing angle-resolved photoemission spectroscopy, we reveal the spectroscopic fingerprint of short-range antiferromagnetic order in conjunction with enhanced electron-phonon interaction in the electron-doped cuprate superconductor $\mathrm{Nd_{1.85}Ce_{0.15}CuO_4}$. The observed mode coupling exhibits a strong momentum dependence that is in striking contrast to the node-antinode dichotomy previously observed in the hole-doped cuprates. Our results reveal an intimate relationship between electron-phonon coupling and antiferromagnetic fluctuations, which collectively sets the stage for unconventional superconductivity in the electron-doped cuprates.