A study from Rice University reveals that localized electrons, rather than mobile electrons, drive magnetism in kagome magnets, specifically in iron-tin (FeSn) thin films.
The latest research led by Zheng Ren and Ming Yi, associate prof. & physicists, Rice University shows significant magnetic and electronic properties in kagome magnets, which are defined by their unique lattice structures reminiscent of an ancient basket-weaving pattern. The findings indicate that the magnetism in FeSn arises from localized electron interactions, shifting away from the long-held belief that mobile electrons were responsible for magnetic behaviours. This research holds considerable promise for various stakeholders, including academic researchers, material scientists, and engineers focused on the development of quantum computing and superconductors, as well as industry professionals looking to implement advanced materials in emerging technologies.
“This work is expected to stimulate further experimental and theoretical studies on the emergent properties of quantum materials,” said Yi. The team’s innovative approach employed molecular beam epitaxy combined with angle-resolved photoemission spectroscopy to produce high-quality FeSn thin films, revealing that even at elevated temperatures, localized electrons are pivotal in determining the magnetic characteristics of these materials.
The study highlights the phenomenon of selective band renormalization, where certain electron orbitals demonstrate stronger interactions, offering fresh insights into the intricate relationship between electron behaviour and magnetism. Ren emphasized, “Our study highlights the complex interplay between magnetism and electron correlations in kagome magnets.”
Beyond enhancing the comprehension of FeSn, the research bears broader implications for materials with similar characteristics. Insights gained from this study may influence the development of innovative technologies, including high-temperature superconductors and topological quantum computing.
The interplay of magnetism and flat bands in these materials can potentially facilitate the creation of quantum states applicable in quantum logic gates.
