Anomalous Hall effect from inter-superlattice scattering in a noncollinear antiferromagnet

Lilia S. Xie (), Shannon S. Fender, Cameron Mollazadeh, Wuzhang Fang, Matthias D. Frontzek, Samra Husremović, Kejun Li, Isaac M. Craig, Berit H. Goodge, Matthew P. Erodici, Oscar Gonzalez, Jonathan D. Denlinger, Yuan Ping and D. Kwabena Bediako ()
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Lilia S. Xie: University of California
Shannon S. Fender: University of California
Cameron Mollazadeh: University of California
Wuzhang Fang: University of Wisconsin
Matthias D. Frontzek: Oak Ridge National Laboratory (ORNL), Oak Ridge
Samra Husremović: University of California
Kejun Li: University of Wisconsin
Isaac M. Craig: University of California
Berit H. Goodge: University of California
Matthew P. Erodici: University of California
Oscar Gonzalez: University of California
Jonathan D. Denlinger: Lawrence Berkeley National Laboratory
Yuan Ping: University of Wisconsin
D. Kwabena Bediako: University of California

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Superlattice formation dictates the physical properties of many materials, including the nature of the ground state in magnetic materials. Chemical composition is commonly considered to be the primary determinant of superlattice identity, especially in intercalation compounds. Nevertheless, in this work, we find that kinetic control of superlattice growth leads to the coexistence of disparate crystallographic domains within a compositionally perfect single crystal. We demonstrate that Cr1/4TaS2 is a noncollinear antiferromagnet in which scattering between majority and minority superlattice domains engenders complex magnetotransport below the Néel temperature, including an anomalous Hall effect. We characterize the magnetic phases in different domains, image their nanoscale morphology, and propose a mechanism for nucleation and growth using a suite of experimental probes coupled with first-principles calculations and symmetry analysis. These results provide a blueprint for the deliberate engineering of macroscopic transport responses via microscopic tuning of magnetic exchange interactions in superlattice domains.

Date: 2025
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DOI: 10.1038/s41467-025-61211-4

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