High pressure crystal structure of magnetic Weyl semimetals: FeSn, Fe3Sn2, and Fe3Sn

So-called magnetic Weyl semimetals (in the current study Fe-Sn binary compounds (FeSn, Fe3Sn2, and Fe3Sn) combine topologically non-trivial band structures and flat-band ferromagnetism, both arising from the underlying kagome network of the Fe atoms. The structure of this network and ensuing electronic properties can be tuned by pressure. We seek to determine this structural evolution by XRD, while simultaneously probing changes in the electronic structure via optical spectroscopy under pressure. By a systematic study of three Fe-Sn compounds with different stacking sequences we will obtain insight into the evolution of kagome nets under pressure and its implications on the underlying electronic structure.