Hall anomalies in the centrosymmetric triangular-lattice antiferromagnet GdGa2

doi:10.1088/1674-1056/ae2672

Abstract Skyrmions emerging in centrosymmetric materials have garnered significant interest. GdGa$_{2}$, a recently discovered centrosymmetric antiferromagnet with a triangular lattice, has been proposed to host possible Néel-type skyrmions exhibiting an extremely short magnetic periodicity in the so-called A-phases. Here, we report the magnetic and magnetotransport properties of GdGa$_{2}$ single crystals. Hall anomalies beyond magnetization scaling emerge at intermediate magnetic fields, coinciding with the skyrmion-hosting A-phases. The small amplitude of the Hall anomalies may be attributed to the short period of the spin textures. In contrast, the transport behavior of TbGa$_{2}$ single crystals is well described by a conventional two-band model. This discrepancy likely arises from distinct Ruderman-Kittel-Kasuya-Yosida interaction strengths and/or magnetic anisotropy between the two crystals. Our results establish GdGa$_{2}$ as a new material platform for the exploration of skyrmion physics in centrosymmetric systems.

Keywords: skyrmions in centrosymmetric materials rare-earth antiferromagnets topological Hall effect

Received: 14 September 2025
Revised: 22 November 2025
Accepted manuscript online: 02 December 2025

PACS:	75.47.-m	(Magnetotransport phenomena; materials for magnetotransport)
	12.39.Dc	(Skyrmions)
	71.20.Eh	(Rare earth metals and alloys)

Fund: This project was supported by the National Natural Science Foundation of China (Grant Nos. 12274125, 12574117, 12374105, and 12174103).

Corresponding Authors: Tian Shang, Yang Xu
E-mail: tshang@phy.ecnu.edu.cn;yxu@phy.ecnu.edu.cn

Cite this article:

Sidi Wang(王思迪), Jiyuan Li(李纪源), Yuhao Wang(王宇豪), Keqi Xia(夏克奇), Jing Meng(孟婧), Bocheng Yu(余博丞), Yiqian Hu(胡艺骞), Zheng Li(李峥), Hui Zhang(张慧), Jingzhong Luo(罗晶中), Dongmei Jiang(蒋冬梅), Qingfeng Zhan(詹清峰), Tian Shang(商恬), and Yang Xu(徐杨) Hall anomalies in the centrosymmetric triangular-lattice antiferromagnet GdGa₂ 2026 Chin. Phys. B 35 027502

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Hall anomalies in the centrosymmetric triangular-lattice antiferromagnet GdGa2

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Hall anomalies in the centrosymmetric triangular-lattice antiferromagnet GdGa₂