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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator

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Rosa, Priscila [1] ; Xu, Yuanfeng [2] ; Rahn, Marein [1] ; Souza, Jean [3] ; Kushwaha, Satya [4, 1] ; Veiga, Larissa [5] ; Bombardi, Alessandro [6] ; Thomas, Sean [1] ; Janoschek, Marc [7] ; Bauer, Eric [1] ; Chan, Mun [4] ; Wang, Zhijun [8, 9, 10] ; Thompson, Joe [1] ; Harrison, Neil [4] ; Pagliuso, Pascoal [3] ; Bernevig, Andrei [11] ; Ronning, Filip [1]
Total Authors: 17
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[1] Los Alamos Natl Lab, Quantum Grp, Los Alamos, NM 87545 - USA
[2] Max Planck Inst Microstruct Phys, D-06120 Halle - Germany
[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[4] Los Alamos Natl Lab, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 - USA
[5] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT - England
[6] Diamond Light Source, Sci & Innovat Campus, Didcot OX11 0DE, Oxon - England
[7] Paul Scherrer Inst, Lab Neutron & Muon Instrumentat, Villigen - Switzerland
[8] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190 - Peoples R China
[9] Chinese Acad Sci, Inst Phys, Beijing 100190 - Peoples R China
[10] Univ Chinese Acad Sci, Beijing 100049 - Peoples R China
[11] Princeton Univ, Dept Phys, Princeton, NJ 08544 - USA
Total Affiliations: 11
Document type: Journal article
Source: NPJ QUANTUM MATERIALS; v. 5, n. 1 JUL 24 2020.
Web of Science Citations: 0

Here we investigate antiferromagnetic Eu5In2Sb6, a nonsymmorphic Zintl phase. Our electrical transport data show that Eu5In2Sb6 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 Eu5In2Sb6 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 Eu5In2Sb6 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. (AU)

FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
Grantee:Pascoal Jose Giglio Pagliuso
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/04870-7 - Studies of novel complex and advanced materials
Grantee:Pascoal Jose Giglio Pagliuso
Support type: Research Projects - Thematic Grants
FAPESP's process: 18/11364-7 - Magnetic properties of complex systems with non-trivial topology
Grantee:Jean Carlo Souza
Support type: Scholarships in Brazil - Doctorate