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

Bin Gao; Tong Chen; Xiao Chuan Wu; Michael Flynn; Chunruo Duan; Lebing Chen; Chien Lung Huang; Jesse Liebman; Shuyi Li; Feng Ye; Matthew B. Stone; Andrey Podlesnyak; Douglas L. Abernathy; Devashibhai T. Adroja; Manh Duc Le; Qingzhen Huang; Andriy H. Nevidomskyy; Emilia Morosan; Leon Balents; Pengcheng Dai

doi:10.1038/s41467-023-37669-5

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

Bin Gao, Tong Chen, Xiao Chuan Wu, Michael Flynn, Chunruo Duan, Lebing Chen, Chien Lung Huang, Jesse Liebman, Shuyi Li, Feng Ye, Matthew B. Stone, Andrey Podlesnyak, Douglas L. Abernathy, Devashibhai T. Adroja, Manh Duc Le, Qingzhen Huang, Andriy H. Nevidomskyy, Emilia Morosan, Leon Balents, Pengcheng Dai

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

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 Ni₂Mo₃O₈, where Ni²⁺ 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.

Original language	English
Article number	2051
Journal	Nature Communications
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41467-023-37669-5
Publication status	Published - Dec 2023
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Biochemistry,Genetics and Molecular Biology
General Physics and Astronomy

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Gao, B., Chen, T., Wu, X. C., Flynn, M., Duan, C., Chen, L., Huang, C. L., Liebman, J., Li, S., Ye, F., Stone, M. B., Podlesnyak, A., Abernathy, D. L., Adroja, D. T., Duc Le, M., Huang, Q., Nevidomskyy, A. H., Morosan, E., Balents, L., & Dai, P. (2023). Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system. Nature Communications, 14(1), Article 2051. https://doi.org/10.1038/s41467-023-37669-5

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title = "Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system",

abstract = "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 Ni2Mo3O8, where Ni2+ 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.",

author = "Bin Gao and Tong Chen and Wu, {Xiao Chuan} and Michael Flynn and Chunruo Duan and Lebing Chen and Huang, {Chien Lung} and Jesse Liebman and Shuyi Li and Feng Ye and Stone, {Matthew B.} and Andrey Podlesnyak and Abernathy, {Douglas L.} and Adroja, {Devashibhai T.} and {Duc Le}, Manh and Qingzhen Huang and Nevidomskyy, {Andriy H.} and Emilia Morosan and Leon Balents and Pengcheng Dai",

note = "Publisher Copyright: {\textcopyright} 2023, The Author(s).",

year = "2023",

month = dec,

doi = "10.1038/s41467-023-37669-5",

language = "English",

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journal = "Nature Communications",

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Gao, B, Chen, T, Wu, XC, Flynn, M, Duan, C, Chen, L, Huang, CL, Liebman, J, Li, S, Ye, F, Stone, MB, Podlesnyak, A, Abernathy, DL, Adroja, DT, Duc Le, M, Huang, Q, Nevidomskyy, AH, Morosan, E, Balents, L & Dai, P 2023, 'Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system', Nature Communications, vol. 14, no. 1, 2051. https://doi.org/10.1038/s41467-023-37669-5

TY - JOUR

T1 - Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system

AU - Gao, Bin

AU - Chen, Tong

AU - Wu, Xiao Chuan

AU - Flynn, Michael

AU - Duan, Chunruo

AU - Chen, Lebing

AU - Huang, Chien Lung

AU - Liebman, Jesse

AU - Li, Shuyi

AU - Ye, Feng

AU - Stone, Matthew B.

AU - Podlesnyak, Andrey

AU - Abernathy, Douglas L.

AU - Adroja, Devashibhai T.

AU - Duc Le, Manh

AU - Huang, Qingzhen

AU - Nevidomskyy, Andriy H.

AU - Morosan, Emilia

AU - Balents, Leon

AU - Dai, Pengcheng

PY - 2023/12

Y1 - 2023/12

N2 - 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 Ni2Mo3O8, where Ni2+ 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.

AB - 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 Ni2Mo3O8, where Ni2+ 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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DO - 10.1038/s41467-023-37669-5

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SN - 2041-1723

VL - 14

JO - Nature Communications

JF - Nature Communications

IS - 1

M1 - 2051

ER -

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

Abstract

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