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Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system

Magnetic order in most materials occurs when magnetic ions with finite moments arrange in a particular pattern below the ordering temperature. Intriguingly, if the crystal electric field (CEF) effect results in a spin-singlet ground state, a magnetic order can still occur due to the exchange interac...

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Autores principales: Gao, Bin, Chen, Tong, Wu, Xiao-Chuan, Flynn, Michael, Duan, Chunruo, Chen, Lebing, Huang, Chien-Lung, Liebman, Jesse, Li, Shuyi, Ye, Feng, Stone, Matthew B., Podlesnyak, Andrey, Abernathy, Douglas L., Adroja, Devashibhai T., Duc Le, Manh, Huang, Qingzhen, Nevidomskyy, Andriy H., Morosan, Emilia, Balents, Leon, Dai, Pengcheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10097669/
https://www.ncbi.nlm.nih.gov/pubmed/37045810
http://dx.doi.org/10.1038/s41467-023-37669-5
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author Gao, Bin
Chen, Tong
Wu, Xiao-Chuan
Flynn, Michael
Duan, Chunruo
Chen, Lebing
Huang, Chien-Lung
Liebman, Jesse
Li, Shuyi
Ye, Feng
Stone, Matthew B.
Podlesnyak, Andrey
Abernathy, Douglas L.
Adroja, Devashibhai T.
Duc Le, Manh
Huang, Qingzhen
Nevidomskyy, Andriy H.
Morosan, Emilia
Balents, Leon
Dai, Pengcheng
author_facet Gao, Bin
Chen, Tong
Wu, Xiao-Chuan
Flynn, Michael
Duan, Chunruo
Chen, Lebing
Huang, Chien-Lung
Liebman, Jesse
Li, Shuyi
Ye, Feng
Stone, Matthew B.
Podlesnyak, Andrey
Abernathy, Douglas L.
Adroja, Devashibhai T.
Duc Le, Manh
Huang, Qingzhen
Nevidomskyy, Andriy H.
Morosan, Emilia
Balents, Leon
Dai, Pengcheng
author_sort Gao, Bin
collection PubMed
description Magnetic order in most materials occurs when magnetic ions with finite moments arrange in a particular pattern below the ordering temperature. Intriguingly, if the crystal electric field (CEF) effect results in a spin-singlet ground state, a magnetic order can still occur due to the exchange interactions between neighboring ions admixing the excited CEF levels. The magnetic excitations in such a state are spin excitons generally dispersionless in reciprocal space. Here we use neutron scattering to study stoichiometric Ni(2)Mo(3)O(8), where Ni(2+) ions form a bipartite honeycomb lattice comprised of two triangular lattices, with ions subject to the tetrahedral and octahedral crystalline environment, respectively. We find that in both types of ions, the CEF excitations have nonmagnetic singlet ground states, yet the material has magnetic order. Furthermore, CEF spin excitons from the tetrahedral sites form a dispersive diffusive pattern around the Brillouin zone boundary, likely due to spin entanglement and geometric frustrations.
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spelling pubmed-100976692023-04-14 Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system Gao, Bin Chen, Tong Wu, Xiao-Chuan Flynn, Michael Duan, Chunruo Chen, Lebing Huang, Chien-Lung Liebman, Jesse Li, Shuyi Ye, Feng Stone, Matthew B. Podlesnyak, Andrey Abernathy, Douglas L. Adroja, Devashibhai T. Duc Le, Manh Huang, Qingzhen Nevidomskyy, Andriy H. Morosan, Emilia Balents, Leon Dai, Pengcheng Nat Commun Article Magnetic order in most materials occurs when magnetic ions with finite moments arrange in a particular pattern below the ordering temperature. Intriguingly, if the crystal electric field (CEF) effect results in a spin-singlet ground state, a magnetic order can still occur due to the exchange interactions between neighboring ions admixing the excited CEF levels. The magnetic excitations in such a state are spin excitons generally dispersionless in reciprocal space. Here we use neutron scattering to study stoichiometric Ni(2)Mo(3)O(8), where Ni(2+) ions form a bipartite honeycomb lattice comprised of two triangular lattices, with ions subject to the tetrahedral and octahedral crystalline environment, respectively. We find that in both types of ions, the CEF excitations have nonmagnetic singlet ground states, yet the material has magnetic order. Furthermore, CEF spin excitons from the tetrahedral sites form a dispersive diffusive pattern around the Brillouin zone boundary, likely due to spin entanglement and geometric frustrations. Nature Publishing Group UK 2023-04-12 /pmc/articles/PMC10097669/ /pubmed/37045810 http://dx.doi.org/10.1038/s41467-023-37669-5 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Gao, Bin
Chen, Tong
Wu, Xiao-Chuan
Flynn, Michael
Duan, Chunruo
Chen, Lebing
Huang, Chien-Lung
Liebman, Jesse
Li, Shuyi
Ye, Feng
Stone, Matthew B.
Podlesnyak, Andrey
Abernathy, Douglas L.
Adroja, Devashibhai T.
Duc Le, Manh
Huang, Qingzhen
Nevidomskyy, Andriy H.
Morosan, Emilia
Balents, Leon
Dai, Pengcheng
Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
title Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
title_full Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
title_fullStr Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
title_full_unstemmed Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
title_short Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
title_sort diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10097669/
https://www.ncbi.nlm.nih.gov/pubmed/37045810
http://dx.doi.org/10.1038/s41467-023-37669-5
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