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Journal Article

Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator


Xu,  Yuanfeng
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Rosa, P., Xu, Y., Rahn, M., Souza, J., Kushwaha, S., Veiga, L., et al. (2020). Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator. npj Quantum Materials, 5(1): 52. doi:10.1038/s41535-020-00256-8.

Cite as: https://hdl.handle.net/21.11116/0000-0008-A856-A
Here we investigate antiferromagnetic Eu<sub>5</sub>In<sub>2</sub>Sb<sub>6</sub>, a nonsymmorphic Zintl phase. Our electrical transport data show that Eu<sub>5</sub>In<sup>2</sub>Sb<sub>6</sub> is remarkably insulating and exhibits an exceptionally large negative magnetoresistance, which is consistent with the presence of magnetic polarons. From ab initio calculations, the paramagnetic state of Eu<sub>5</sub>In<sub>2</sub>Sb<sub>6</sub> is a topologically nontrivial semimetal within the generalized gradient approximation (GGA), whereas an insulating state with trivial topological indices is obtained using a modified Becke−Johnson potential. Notably, GGA + U calculations suggest that the antiferromagnetic phase of Eu<sub>5</sub>In<sub>2</sub>Sb<sub>6</sub> may host an axion insulating state. Our results provide important feedback for theories of topological classification and highlight the potential of realizing clean magnetic narrow-gap semiconductors in Zintl materials.