We report strong spin−orbit torques (SOTs) generated by

noncollinear antiferromagnets Mn3Ni0.35Cu0.65N, over a wide temperature range.

The SOT efficiency peaks up to 0.3 at the Néel temperature (TN), substantially

higher than that of commonly studied nonmagnets, such as Pt. The sign and

magnitude of the SOTs measured in our experiments are corroborated by

density functional theory, confirming the dominance of the orbital Hall effect

over the spin Hall effect in the nonmagnetic phase above TN. In contrast, the

strong temperature-dependent SOTs observed around and below TN can be

explained by recently developed mechanisms involving chirality-induced and

extrinsic scattering-driven spin and orbital currents, considering the effect of spin

fluctuations at finite temperatures. Our work not only reports a large magnitude of SOT but also sheds light on a new possible origin

where orbital currents can be harnessed by leveraging the chirality of noncollinear antiferromagnets, which holds promise for

magnetic memory applications.

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