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This study utilizes nonmagnetic tin impurities to resolve geometric frustration in kagome lattices, successfully revealing hidden quantum magnetic moments that were previously obscured. The findings demonstrate that local ionic spins play a critical role in the correlated behavior of these superconductors, shifting the understanding from purely itinerant carrier models to those incorporating strong spin correlations. This breakthrough provides essential insights into the interplay between lattice geometry and magnetism in complex quantum materials.
Kagome superconductors’ quantum magnetic moments revealed with tin impurities

Researchers revealed quantum magnetic moments in Kagome superconductors, using tin impurities to probe their unique electronic properties.
Researchers at Shanghai Jiao Tong University and the University of California Santa Barbara deliberately introduced tin impurities into kagome superconductors to reveal previously hidden quantum magnetic moments. The work demonstrates that vanadium and titanium ions within these materials both exhibit a 2+ valence, resulting in similar itinerant carrier densities, while differences in electron count manifest as fluctuating ionic magnetic moments. Due to the materials' frustrated lattice geometry, these local moments proved difficult to observe until the team relieved the frustration with nonmagnetic impurities, finding a systematic increase in magnetic susceptibility as impurity levels rose. This discovery suggests a shift from understanding these superconductors solely…
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