Antiferromagnetic fluctuations and d-wave superconductivity in electron-doped high-temperature superconductors

TL;DR

This paper investigates how antiferromagnetic fluctuations influence d-wave superconductivity in electron-doped cuprates, revealing a balance between enhancement and suppression of pairing near half-filling, supported by comparisons with Quantum Monte Carlo simulations.

Contribution

It provides a detailed theoretical analysis of the interplay between antiferromagnetic fluctuations and superconductivity in electron-doped high-Tc materials, explaining experimental observations.

Findings

Antiferromagnetic fluctuations enhance d-wave pairing at weak to intermediate coupling.

Proximity to half-filling leads to pseudogap formation that suppresses superconductivity.

The approach explains negative pressure effects on Tc and photoemission hot spots.

Abstract

We show that, at weak to intermediate coupling, antiferromagnetic fluctuations enhance d-wave pairing correlations until, as one moves closer to half-filling, the antiferromagnetically-induced pseudogap begins to suppress the tendency to superconductivity. The accuracy of our approach is gauged by detailed comparisons with Quantum Monte Carlo simulations. The negative pressure dependence of Tc and the existence of photoemission hot spots in electron-doped cuprate superconductors find their natural explanation within this approach.