Abstract
Topological insulators with intrinsic magnetic ordering, potentially hosting rare quantum effects, recently attracted extensive attention. is the first established example. The Sb-doped variant shows a great variety of electronic properties depending on the Sb content , such as shifts in the Fermi level and the Néel temperature , and the change of the free charge carrier type from to type at high Sb substitution ratios. Here, we investigate the effect of magnetic ordering on the bulk electronic structure of with high Sb content by temperature-dependent reflectivity measurements over a broad frequency range. We observe anomalies in the optical response across when the antiferromagnetic order sets, which suggests a coupling between the magnetic ordering and the electronic structure of the material.
- Received 24 February 2022
- Revised 13 April 2022
- Accepted 3 May 2022
DOI:https://doi.org/10.1103/PhysRevB.105.195125
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