Static and dynamical properties of the spin-$\frac{5}{2}$ nearly ideal triangular lattice antiferromagnet $\mathrm{Ba_3}$ $\mathrm{MnSb_2}$ $\mathrm{O_9}$

Shu, Mingfang; Dong, Weicen; Jiao, Jinlong; Wu, Jiangtao; Lin, Gaoting; Kamiya, Yoshitomo; Hong, Tao; Cao, Huibo; Matsuda, Masaaki; Tian, Wei; Chi, Songxue; Ehlers, Georg; Ouyang, Zhongwen; Chen, Hongwei; Zou, Youming; Qu, Zhe; Huang, Qing; Zhou, Haidong; Ma, Jie

doi:10.1103/physrevb.108.174424

Static and dynamical properties of the spin-$$\frac{5}{2}$$ nearly ideal triangular lattice antiferromagnet $$\mathrm{Ba_3}$$ $$\mathrm{MnSb_2}$$ $$\mathrm{O_9}$$

Journal Article · Wed Nov 15 23:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.174424· OSTI ID:2224152

^[1]; Dong, Weicen ^[1]; ^[1]; Wu, Jiangtao ^[1]; Lin, Gaoting ^[1]; ^[1]; ^[2]; ^[2]; ^[2]; ^[2]; ^[2]; ^[2]; Ouyang, Zhongwen ^[3]; Chen, Hongwei ^[4]; Zou, Youming ^[5]; ^[5]; Huang, Qing ^[6]; Zhou, Haidong ^[7]; ^[8]

Shanghai Jiao Tong Univ. (China). Key Laboratory of Artificial Structures and Quantum Control; Nanjing Univ. (China)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Huazhong Univ. of Science and Technology, Wuhan (China)
Chinese Academy of Sciences (CAS), Hefei (China). Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions; China Jiliang Univ., Hangzhou (China)
Chinese Academy of Sciences (CAS), Hefei (China). Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions
Univ. of Tennessee, Knoxville, TN (United States); Louisiana State Univ., Baton Rouge, LA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Shanghai Jiao Tong Univ. (China). Key Laboratory of Artificial Structures and Quantum Control; Nanjing Univ. (China); Huazhong Univ. of Science and Technology, Wuhan (China)

Here, we study the ground state and spin excitations in Ba₃ MnSb₂ O₉, an easy-plane S = 5/2 triangular lattice antiferromagnet. By combining single-crystal neutron scattering, electric spin resonance (ESR), and spin wave calculations, we determine the frustrated quasi-two-dimensional spin Hamiltonian parameters describing the material. While the material has a slight monoclinic structural distortion, which could allow for isosceles-triangular exchanges and biaxial anisotropy by symmetry, we observe no deviation from the behavior expected for spin waves in the in-plane $120$° state. Even the easy-plane anisotropy is so small that it can only be detected by ESR in our study. In conjunction with the quasi-two-dimensionality, our study establishes that Ba₃ MnSb₂ O₉ is a nearly ideal triangular lattice antiferromagnet with the quasiclassical spin S = 5/2, which suggests that it has the potential for an experimental study of Z- or Z₂-vortex excitations.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2224152

Alternate ID(s):: OSTI ID: 2221872

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Static and dynamical properties of the spin-$$\frac{5}{2}$$ nearly ideal triangular lattice antiferromagnet $$\mathrm{Ba_3}$$ $$\mathrm{MnSb_2}$$ $$\mathrm{O_9}$$

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