Hall anomalies in the centrosymmetric triangular-lattice antiferromagnet GdGa₂

Skyrmions emerging in centrosymmetric materials have garnered significant interest. GdGa₂, 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 GdGa₂ 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 TbGa₂ 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 GdGa₂ as a new material platform for the exploration of skyrmion physics in centrosymmetric systems.