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  Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0008-A856-A Version Permalink: https://hdl.handle.net/21.11116/0000-0009-4F81-D
Genre: Journal Article

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 Creators:
Rosa, Priscila1, Author
Xu, Yuanfeng2, Author
Rahn, Marein1, Author
Souza, Jean1, Author
Kushwaha, Satya1, Author
Veiga, Larissa1, Author
Bombardi, Alessandro1, Author
Thomas, Sean1, Author
Janoschek, Marc1, Author
Bauer, Eric1, Author
Chan, Mun1, Author
Wang, Zhijun1, Author
Thompson, Joe1, Author
Harrison, Neil1, Author
Pagliuso, Pascoal1, Author
Bernevig, B. Andrei1, Author
Ronning, Filip1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Max Planck Institute of Microstructure Physics, Max Planck Society, Weinberg 2, 06120 Halle, DE, ou_2415691              

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 Abstract: 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.

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 Dates: 2020-07-24
 Publication Status: Published online
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 Identifiers: BibTex Citekey: P13974
DOI: 10.1038/s41535-020-00256-8
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Title: npj Quantum Materials
  Other : npj Quantum Mater.
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 5 (1) Sequence Number: 52 Start / End Page: - Identifier: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648