Tunable non-coplanar magnetism and exotic transport phenomena in the magnetic Weyl semimetal candidate DyB₄

Magnetic Weyl systems provide an ideal platform for exploring exotic transport phenomena arising from the interplay between magnetism and band topology, particularly those associated with noncoplanar spin arrangements. Among rare-earth tetraborides RB₄ (R = rare earth), the coexistence of strongly localized 4f magnetism and quadrupole degrees of freedom enables the realization of such noncoplanar spin textures. Here, we show that DyB₄ is a magnetic Weyl semimetal candidate with tunable non-coplanar spin configurations, exhibiting an extraordinary combination of transport responses, including extremely large unsaturated magneto-resistance (XMR), chiral-anomaly-like negative magneto-resistance, and exceptionally large anomalous Hall conductivity (AHC). First-principles calculations reveal magnetically induced Weyl points near the Fermi level, consistent with the observed chiral anomaly and large AHC. These findings establish DyB₄ as a versatile platform for investigating the interplay among magnetism, topology, and strong electron correlations, offering new opportunities for realizing spin-topological quantum functionalities.