open access

https://hdl.handle.net/2115/99874

Large anomalous Hall effect in double-Q magnets without net scalar spin chirality

英語

2026-05-01

American Physical Society

Physical Review B

113(18)

Multi-Q magnets consist of superposed spin-density waves with distinct magnetic modulation vectors, enabling a wide range of magnetic orders depending on their combination. Among them, topologically nontrivial spin textures, such as a magnetic skyrmion, have been extensively studied owing to the emergence of topological Hall effects induced by real-space scalar spin chirality. Contrary to this expectation, we theoretically investigate another route to enhancing the Hall response under a topologically trivial double-Q spin textures with neither net scalar spin chirality nor a nonzero skyrmion number. Despite the cancellation of the scalar spin chirality, the double-Q magnetism exhibits a Hall response significantly larger than that of the ferromagnetic phase with a nonmonotonic dependence on the uniform magnetization, which is in stark contrast with a ferromagnetic state and a single-Q spiral state. Analyzing the multiorbital Kondo lattice model, we show that orbital hybridization induced by the double-Q superstructure result in a proliferation of Berry curvature hot spots in k space, thereby giving rise to a large anomalous Hall effect (AHE). This mechanism accounts for the observed giant AHE in GdRu2Si2 and GdRu2Ge2, thereby highlighting topologically trivial double-Q spin textures as promising spintronic materials.

学術雑誌論文

Accepted Manuscript

©2026 American Physical Society

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