The resonance peak in the electron-doped cuprate superconductors

TL;DR

This paper investigates the magnetic resonance peak in electron-doped cuprate superconductors, showing it aligns with an overdamped spin exciton model and predicting its behavior under magnetic fields and temperature changes.

Contribution

It provides a theoretical explanation for the resonance peak in electron-doped cuprates and predicts its magnetic-field and temperature dependence, extending understanding of their superconducting state.

Findings

Resonance peak is consistent with an overdamped spin exciton.

Predictions for magnetic-field dependence of the resonance.

Predictions for temperature evolution in coexistence phases.

Abstract

We study the emergence of a magnetic resonance in the superconducting state of the electron-doped cuprate superconductors. We show that the recently observed resonance peak in the electron-doped superconductor Pr$_{0.88}$LaCe$_{0.12}$CuO$_{4-\delta}$ is consistent with an overdamped spin exciton located near the particle-hole continuum. We present predictions for the magnetic-field dependence of the resonance mode as well as its temperature evolution in those parts of the phase diagram where $d_{x^2-y^2}$-wave superconductivity may coexist with an antiferromagnetic spin-density wave.