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Surface and electronic structure at atomic length scales of the non-symmorphic antiferromagnet Eu $_{5}$ In $_{2}$ Sb $_{6}$

arXiv:2204.07001 · doi:10.1103/PhysRevB.106.035124

Abstract

We performed Scanning Tunneling Microscopy and Spectroscopy (STM/STS) measurements to investigate the Zintl phase Eu $_{5}$ In $_{2}$ Sb $_{6}$ , a non-symmorphic antiferromagnet. The theoretical prediction of a non-trivial Fermi surface topology stabilized by the non-symmorphic symmetry motivated our research. On the cleaved (010) plane, we obtained striped patterns that can be correlated to the stacking of the [In $_{2}$ Sb $_{6}$ ] $^{10 -}$ double chains along the crystallographic $c$ axis. The attempted cleavage along the $a$ axis revealed a more complex pattern. We combined the STS measurement on non-reconstructed (010) and (081) surfaces with DFT calculations to further elucidate the electronic structure of Eu $_{5}$ In $_{2}$ Sb $_{6}$ . From our investigations so far, direct experimental evidence of the predicted topological surface states remains elusive.

Surface and electronic structure at atomic length scales of the non-symmorphic antiferromagnet Eu5​In2​Sb6​

Abstract

Surface and electronic structure at atomic length scales of the non-symmorphic antiferromagnet Eu $_{5}$ In $_{2}$ Sb $_{6}$