Experiments reveal link between intertwined states in ‘kagome’ metal. Physicists were surprised by the 2022 discovery that electrons in magnetic iron-germanium crystals could spontaneously and collectively organize their charges into a pattern featuring a standing wave. Magnetism also arises from
The iron-germanium materials are kagome lattice crystals, a much-studied family of materials featuring 2D arrangements of atoms reminiscent of the weave pattern in traditional Japanese kagome baskets, which features equilateral triangles that touch at the corners.
By nature, electrons avoid one another. One way they do this is to order their magnetic states — spins that point either up or down — in the opposite direction of their neighbors’ spins. Yi said the lattice restricts electrons in ways that “can have a direct impact on the observable properties of the material,” and the team was able to use that “to probe deeper into the origins of the intertwinement of the magnetism and charge density wave” in iron-germanium.
“These probes allowed us to look at what both the electrons and the lattice were doing as the charge density wave was taking shape,” she said.
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