Large anomalous Hall effect induced by gapped nodal lines in GdZn and GdCd

TL;DR

This study reveals that GdZn and GdCd exhibit a large anomalous Hall effect due to gapped nodal lines caused by magnetization breaking mirror symmetries, highlighting their potential for topological-magnetic interplay exploration.

Contribution

First-principles calculations show how gapped nodal lines in GdZn and GdCd induce a significant anomalous Hall effect, linking topology and magnetism.

Findings

GdZn and GdCd host nodal lines near the Fermi level.

Breaking mirror symmetries gaps the nodal lines.

Gapped nodal lines lead to a large Berry curvature and Hall effect.

Abstract

The topological properties and intrinsic anomalous Hall effect of CsCl-type ferromagnets GdZn and GdCd have been studied based on first-principles electronic structure calculations. According to the calculated band structures, both GdZn and GdCd host nodal lines near the Fermi level. Once the magnetization breaks the mirror symmetries, the nodal lines are gapped. This can create a huge Berry curvature. A large anomalous Hall effect is then generated when the Fermi level resides within the opened gaps of the nodal lines. Our works indicate that GdZn and GdCd can provide a promising platform for exploring the interplay between topological property and magnetism.