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Topological metal-insulator transition within the ferromagnetic state
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Journal Article
Topological metal-insulator transition within the ferromagnetic state
2026
Overview
A major challenge in condensed matter physics is integrating topological phenomena with correlated electron physics to leverage both types of states for next-generation quantum devices. Metal-insulator transitions are central to bridging these two domains while simultaneously serving as on-off switches for electronic states. Here, we demonstrate how the prototypical material of K
2
Cr
8
O
16
undergoes a ferromagnetic metal-insulator transition accompanied by a change in band topology. Through inelastic x-ray and neutron scattering experiments combined with first-principles theoretical calculations, we show that this transition is not driven by a Peierls mechanism, given the lack of phonon softening. Instead, we establish the transition as a topological metal-insulator transition within the ferromagnetic phase with potential axionic properties, where electron correlations play a key role in stabilizing the insulating state. These results reveal how a metal-insulator transition provides a pathway through which magnetism, topology, and electronic correlations interact.
Combining topological phenomena with correlated electron physics could help enable next-generation quantum devices. Here, the authors demonstrate a topological metal-insulator transition within the ferromagnetic phase of K
2
Cr
8
O
16
.
