Gap function symmetry and spin dynamics in electron-doped cuprate superconductor

TL;DR

This paper proposes an antiferromagnetic spin fluctuation model for electron-doped cuprate superconductors, explaining the gap symmetry and matching experimental spin susceptibility data.

Contribution

It introduces a pairing model based on AF spin fluctuations that accounts for the nonmonotonic d-wave gap observed in electron-doped cuprates.

Findings

Superconducting gap is monotonic d_{x^2-y^2}-wave.

Nonmonotonic gap behavior explained by AF order.

Calculated spin susceptibility agrees with experiments.

Abstract

An antiferromagnetic (AF) spin fluctuation induced pairing model is proposed for the electron-doped cuprate superconductors. It suggests that, similar to the hole-doped side, the superconducting gap function is monotonic d_{x^2-y^2}-wave and explains why the observed gap function has a nonmonotonic d_{x^2-y^2}-wave behavior when an AF order is taken into account. Dynamical spin susceptibility is calculated and shown to be in good agreement with the experiment. This gives a strong support to the proposed model.