Continuous Spin Excitations in the Three-Dimensional Frustrated Magnet K2Ni2 (SO4)3

Weiliang Yao; Qing Huang; Tao Xie; Andrey Podlesnyak; Alexander Brassington; Chengkun Xing; Ranuri S.Dissanayaka Mudiyanselage; Haozhe Wang; Weiwei Xie; Shengzhi Zhang; Minseong Lee; Vivien S. Zapf; Xiaojian Bai; D. Alan Tennant; Jian Liu; Haidong Zhou

doi:10.1103/PhysRevLett.131.146701

Continuous Spin Excitations in the Three-Dimensional Frustrated Magnet K2Ni2 (SO4)3

Weiliang Yao, Qing Huang, Tao Xie, Andrey Podlesnyak, Alexander Brassington, Chengkun Xing, Ranuri S.Dissanayaka Mudiyanselage, Haozhe Wang, Weiwei Xie, Shengzhi Zhang, Minseong Lee, Vivien S. Zapf, Xiaojian Bai, D. Alan Tennant, Jian Liu, Haidong Zhou

Direct Geometry

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

6 Scopus citations

Abstract

Continuous spin excitations are widely recognized as one of the hallmarks of novel spin states in quantum magnets, such as quantum spin liquids (QSLs). Here, we report the observation of such kind of excitations in K2Ni2(SO4)3, which consists of two sets of intersected spin-1 (Ni2+) trillium lattices. Our inelastic neutron scattering measurement on single crystals clearly shows a dominant excitation continuum, which exhibits a distinct temperature-dependent behavior from that of spin waves, and is rooted in strong quantum spin fluctuations. Further using the self-consistent-Gaussian-approximation method, we determine that the fourth- and fifth-nearest-neighbor exchange interactions are dominant. These two bonds together form a unique three-dimensional network of corner-sharing tetrahedra, which we name as a "hypertrillium"lattice. Our results provide direct evidence for the existence of QSL features in K2Ni2(SO4)3 and highlight the potential for the hypertrillium lattice to host frustrated quantum magnetism.

Original language	English
Article number	146701
Journal	Physical Review Letters
Volume	131
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.131.146701
State	Published - Oct 6 2023

Funding

We wish to thank Tianran Chen, Tong Chen, Seung-Hwan Do, Chunruo Duan, Bin Gao, Dongliang Gong, Martin Mourigal, and Feng Ye for discussion. This research was supported by the U.S. Department of Energy under Grant No. DE-SC0020254. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Part of the work was done in the National High Magnetic Field Laboratory, supported by the U.S. Department of Energy, Office of Science, National Quantum Information Sciences Research Centers, Quantum Science Center. The facilities of the National High Magnetic Field Laboratory are supported by the National Science Foundation Cooperative Agreement No. DMR-1644779, and the State of Florida and the U.S. Department of Energy. S. Z. also acknowledges the LDRD program at Los Alamos National Laboratory. C. X. received partial support from the Center for Material Processing at the University of Tennessee, Knoxville. The work by D.A.T. was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award No. DE-SC0022311.

Funders	Funder number
National Quantum Information Sciences Research Centers
Quantum Science Center
National Science Foundation	DMR-1644779
U.S. Department of Energy	DE-SC0020254
Office of Science
Basic Energy Sciences	DE-SC0022311
University of Tennessee
State of Florida

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Yao, W., Huang, Q., Xie, T., Podlesnyak, A., Brassington, A., Xing, C., Mudiyanselage, R. S. D., Wang, H., Xie, W., Zhang, S., Lee, M., Zapf, V. S., Bai, X., Tennant, D. A., Liu, J., & Zhou, H. (2023). Continuous Spin Excitations in the Three-Dimensional Frustrated Magnet K2Ni2 (SO4)3. Physical Review Letters, 131(14), Article 146701. https://doi.org/10.1103/PhysRevLett.131.146701

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abstract = "Continuous spin excitations are widely recognized as one of the hallmarks of novel spin states in quantum magnets, such as quantum spin liquids (QSLs). Here, we report the observation of such kind of excitations in K2Ni2(SO4)3, which consists of two sets of intersected spin-1 (Ni2+) trillium lattices. Our inelastic neutron scattering measurement on single crystals clearly shows a dominant excitation continuum, which exhibits a distinct temperature-dependent behavior from that of spin waves, and is rooted in strong quantum spin fluctuations. Further using the self-consistent-Gaussian-approximation method, we determine that the fourth- and fifth-nearest-neighbor exchange interactions are dominant. These two bonds together form a unique three-dimensional network of corner-sharing tetrahedra, which we name as a {"}hypertrillium{"}lattice. Our results provide direct evidence for the existence of QSL features in K2Ni2(SO4)3 and highlight the potential for the hypertrillium lattice to host frustrated quantum magnetism.",

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AU - Yao, Weiliang

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AU - Brassington, Alexander

AU - Xing, Chengkun

AU - Mudiyanselage, Ranuri S.Dissanayaka

AU - Wang, Haozhe

AU - Xie, Weiwei

AU - Zhang, Shengzhi

AU - Lee, Minseong

AU - Zapf, Vivien S.

AU - Bai, Xiaojian

AU - Tennant, D. Alan

AU - Liu, Jian

AU - Zhou, Haidong

PY - 2023/10/6

Y1 - 2023/10/6

N2 - Continuous spin excitations are widely recognized as one of the hallmarks of novel spin states in quantum magnets, such as quantum spin liquids (QSLs). Here, we report the observation of such kind of excitations in K2Ni2(SO4)3, which consists of two sets of intersected spin-1 (Ni2+) trillium lattices. Our inelastic neutron scattering measurement on single crystals clearly shows a dominant excitation continuum, which exhibits a distinct temperature-dependent behavior from that of spin waves, and is rooted in strong quantum spin fluctuations. Further using the self-consistent-Gaussian-approximation method, we determine that the fourth- and fifth-nearest-neighbor exchange interactions are dominant. These two bonds together form a unique three-dimensional network of corner-sharing tetrahedra, which we name as a "hypertrillium"lattice. Our results provide direct evidence for the existence of QSL features in K2Ni2(SO4)3 and highlight the potential for the hypertrillium lattice to host frustrated quantum magnetism.

AB - Continuous spin excitations are widely recognized as one of the hallmarks of novel spin states in quantum magnets, such as quantum spin liquids (QSLs). Here, we report the observation of such kind of excitations in K2Ni2(SO4)3, which consists of two sets of intersected spin-1 (Ni2+) trillium lattices. Our inelastic neutron scattering measurement on single crystals clearly shows a dominant excitation continuum, which exhibits a distinct temperature-dependent behavior from that of spin waves, and is rooted in strong quantum spin fluctuations. Further using the self-consistent-Gaussian-approximation method, we determine that the fourth- and fifth-nearest-neighbor exchange interactions are dominant. These two bonds together form a unique three-dimensional network of corner-sharing tetrahedra, which we name as a "hypertrillium"lattice. Our results provide direct evidence for the existence of QSL features in K2Ni2(SO4)3 and highlight the potential for the hypertrillium lattice to host frustrated quantum magnetism.

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Continuous Spin Excitations in the Three-Dimensional Frustrated Magnet K2Ni2 (SO4)3

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