Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator

Autor(es):Mostrar menos -

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]

Afiliação do(s) autor(es):Mostrar menos -

^[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

• Tipo de documento: Artigo Científico
• Fonte: NPJ QUANTUM MATERIALS; v. 5, n. 1 JUL 24 2020.
• Citações Web of Science: 5

Resumo

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)

• Processo FAPESP: 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais
• Processo FAPESP: 12/04870-7 - Estudos de novos materiais complexos e avançados
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/11364-7 - Propriedades magnéticas de sistemas complexos com topologia não-trivial
• Beneficiário: Jean Carlo Souza
• Modalidade de apoio: Bolsas no Brasil - Doutorado