Giant anomalous Hall effect in a Luttinger-compensated topological ferrimagnet UOTe

UOTe, a newly synthesized van der Waals layered magnet with a high Néel temperature (T_Néel ≈ 150K), has emerged as a promising material platform for studying the interplay of topology, time-reversal symmetry breaking, and strong correlations. We report that a one-dimensional (1D) atomic structure supermodulation with a periodicity of ~6.7 unit cells along the a-axis of UOTe significantly modulates its low-energy electronic properties. In longitudinal transport measurements, we observed a pronounced transport anisotropy between the a- and b-axis of the crystal. Meanwhile, transverse transport revealed a giant anomalous Hall effect accompanied by vanishingly small magnetization. Notably, the anomalous Hall angle (tan(θ_H) ≈ 0.2–0.4) is among the highest recorded for bulk magnetic materials. This giant anomalous Hall signal with vanishingly small magnetization suggest a Luttinger-compensated ferrimagnetic state in UOTe (where the Luttinger theorem dictates spin compensation between Uranium atoms). Here, the combination of strong spin-orbit coupling and 1D supermodulation-induced symmetry breaking leads to highly anisotropic Fermi surfaces with local Berry curvature hot spots. Finally, the robust anomalous Hall effect, combined with near-zero magnetization and a large coercive field (up to 8T at ~100K), positions UOTe as a promising candidate for spintronic applications.