Marcasite compounds formed between 3d transition metals and antimony (TMSb2) have been heavily studied due to their intriguing physical properties. For instance they can possess flat bands in their electronic structure, however due to their semiconducting nature, these intriguing electronic states often reside far from the Fermi level, and observations of their properties remained elusive. In addition, the studies of the marcasite series is incomplete across the 3d TMs as the electronic and physical properties of MnSb2 are little studied, as its synthesis requires the application of pressure. We successfully used a high-pressure approach to obtain MnSb2, the last TMSb2 that was still missing, and confirm its marcasite structure. The results of our measurements of electronic transport properties are consistent with the manifestation of a flat band that resides at the vicinity of the Fermi level and being in good agreement with the DFT band structure.
@article{arxiv.2604.25324,
title = {Flat band in multiband-metal MnSb$_2$},
author = {Carl Jonas Linnemann and Kim-Khuong Huynh and Davide Ceresoli and Martin Bremholm},
journal= {arXiv preprint arXiv:2604.25324},
year = {2026}
}