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Updated: Jun 12, 2025

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Published on: July 20, 2022
2D to 3D Magnetism in Synthetic Micas
José Luis Rosas-Huerta1, Jonas Wolber1,2, Claire Minaud1
1Unité de Catalyse et Chimie du Solide (UCCS) - Université de Lille - Centrale Lille, Université Artois, ENSCL, UMR CNRS 8181, Lille, F-59000, France.
Abstract:
Fe-based mica minerals usually display two opposing magnetic ground states, either they behave as spin-glasses or as layered ferrimagnets. No definite reason has been proposed as an explanation for this duality. This conundrum is unraveled by comparing the synthetic micas KFe3[MGe3]O10X2 with M═Fe and Ga, X═OH- and F-. Neutron diffraction demonstrates a 2D to 3D magnetic transition in KFe3[FeGe3]O10(OH)2 while just hints or no order at all are observed for the fluorides with M═Fe and Ga respectively. The 3D transition is triggered by the presence of iron in the intralayer tetrahedra. DFT+U calculations show that the magnetic exchange couplings between the previously believed solely magnetic octahedral layers would otherwise be frustrated without this intralayer iron.
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