Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 36: Weyl Semimetals (joint session MA/TT)

TT 36.6: Talk

Tuesday, March 10, 2026, 15:15–15:30, POT/0361

Giant Anomalous Hall Effect Tuned by Atomic Order in Fe3Pt — •Yibo Wang and Enke Liu — Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

The Berry curvature induced anomalous Hall effect (AHE) has attracted considerable interest in recent years [1,2]. In Fe3Pt, a nodal line situated near the Fermi level generates a pronounced Berry curvature hotspot [3], giving rise to an intrinsic anomalous Hall conductivity (AHC) of 1250 S/cm according to our measurement. Building on this large intrinsic contribution, we sought to enhance the total AHE by deliberately increasing the extrinsic AHC through control of atomic ordering. By annealing Fe3Pt samples at various temperatures and for different durations, we were able to tune the extrinsic AHC continuously from nearly 0 S/cm up to 550 S/cm. The most striking result was obtained for a specimen that was annealed for ten days; at 2 K this sample exhibited a total AHC of 1892 S/cm. This value is a significant value among magnetic topological materials and represents a 50 % increase over the intrinsic contribution alone. These findings confirm the success of the proposed strategy: leveraging a substantial intrinsic Berry curvature AHC and subsequently amplifying the total AHC through extrinsic AHC through mechanisms such as atomic engineering. The approach provides a practical pathway for achieving exceptionally large anomalous Hall responses in magnetic topological systems. [1]Nat. Phys. 14, 1125-1131 (2018). [2] Nat. Phys. 14, 1119-1124 (2018). [3] Adv. Mater. 35, 2301339 (2023).

Keywords: anomalous Hall effect; Berry curvature; magnetic topological materials; atomic order