Low-energy spin dynamics in a Kitaev material Na3Ni2BiO6 investigated by nuclear magnetic resonance

史昕雨 ¹崔祎 ²上官艳艳 ³徐霄宇 ⁴吴占龙 ⁴胡泽 ⁴李硕 ⁴杜柯帆 ⁴陈颖 ⁴马龙 ⁵刘正鑫 ²温锦生 ⁶张金珊 ¹于伟强²

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作者信息

1. Mathematics and Physics Department,North China Electric Power University,Beijing 102206,China
2. Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices,Renmin University of China,Beijing 100872,China;Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education),Renmin University of China,Beijing 100872,China
3. National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China
4. Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices,Renmin University of China,Beijing 100872,China
5. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China
6. National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China;Innovative Center for Advanced Microstructures,Nanjing University,Nanjing 210093,China
折叠

Abstract

We perform 23Na nuclear magnetic resonance(NMR)and magnetization measurements on an S=1,quasi-2D honey-comb lattice antiferromagnet Na3Ni2BiO6.A large positive Curie-Weiss constant of 22.9 K is observed.The NMR spectra at low fields are consistent with a zigzag magnetic order,indicating a large easy-axis anisotropy.With the field applied along the c* axis,the NMR spectra confirm the existence of a 1/3-magnetization plateau phase between 5.1 T and 7.1 T.The transition from the zigzag order to the 1/3-magnetization plateau phase is also found to be a first-order type.A mono-tonic decrease of the spin gap is revealed in the 1/3-magnetization plateau phase,which reaches zero at a quantum critical field HC ≈ 8.35 T before entering the fully polarized phase.These data suggest the existence of exchange frustration in the system along with strong ferromagnetic interactions,hosting the possibility for Kitaev physics.Besides,well below the ordered phase,the 1/T1 at high fields shows either a level off or an enhancement upon cooling below 3 K,which suggests the existence of low-energy fluctuations.

Key words

one-third magnetization plateau phase/nuclear magnetic resonance/honeycomb-lattice antiferro-magnet/Kitaev interaction

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基金项目

国家重点研发计划(2023YFA1406500)

国家重点研发计划(2022YFA1402700)

国家重点研发计划(2021YFA1400400)

国家自然科学基金(12134020)

国家自然科学基金(12374156)

国家自然科学基金(12104503)

国家自然科学基金(12061131004)

国家自然科学基金(12225407)

国家自然科学基金(12074174)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量58

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