Interrelation of Superconducting and Antiferromagnetic Gaps in High-Tc Compounds: a Test Case for the SO(5) Theory

TL;DR

This paper demonstrates that a projected SO(5) theory effectively explains the relationship between antiferromagnetic and superconducting gaps in high-Tc compounds, aligning with recent experimental observations.

Contribution

It shows that the projected SO(5) theory, incorporating the Mott-Hubbard gap, accurately describes the gap characteristics in high-Tc superconductors.

Findings

The theory accounts for the magnitude difference between gaps.

It explains the gap dispersion observed experimentally.

The model aligns with recent ARPES data.

Abstract

Recent angle resolved photoemission data, which found evidence for a d-wave-like modulation of the antiferromagnetic gap, suggest an intimate interrelation between the antiferromagnetic insulator and the superconductor with its d-wave gap. It is shown here that a projected SO(5) theory, which explicitly takes the Mott-Hubbard gap into account, correctly describes the observed gap characteristics. Specifically, it accounts for the order of magnitude difference between the antiferromagnetic gap modulation and the superconducting gap and is also consistent with the gap dispersion.