تقرير
Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator
| العنوان: | Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator |
|---|---|
| المؤلفون: | Rosa, P. F. S., Xu, Yuanfeng, Kushwaha, S. K., Souza, J. C., Rahn, M. C., Veiga, L. S. I., Bombardi, A., Thomas, S. M., Janoschek, M., Bauer, E. D., Chan, M. K., Wang, Zhijun, Thompson, J. D., Pagliuso, P. G., Harrison, N., Bernevig, B. A., Ronning, F. |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Here we investigate antiferromagnetic Eu$_{5}$In$_{2}$Sb$_{6}$, a nonsymmorphic Zintl phase. Our electrical transport data show that Eu$_{5}$In$_{2}$Sb$_{6}$ is remarkably insulating and exhibits an exceptionally large negative magnetoresistance, which is consistent with the presence of magnetic polarons. From {\it ab initio} calculations, the paramagnetic state of Eu$_{5}$In$_{2}$Sb$_{6}$ 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$_{5}$In$_{2}$Sb$_{6}$ 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. Comment: Accepted in npj Quantum Materials. Author list and affiliations corrected |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2007.06556 |
| رقم الأكسشن: | edsarx.2007.06556 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |