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

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

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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.

one-third magnetization plateau phasenuclear magnetic resonancehoneycomb-lattice antiferro-magnetKitaev interaction

史昕雨、崔祎、上官艳艳、徐霄宇、吴占龙、胡泽、李硕、杜柯帆、陈颖、马龙、刘正鑫、温锦生、张金珊、于伟强

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Mathematics and Physics Department,North China Electric Power University,Beijing 102206,China

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

National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China

Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China

Innovative Center for Advanced Microstructures,Nanjing University,Nanjing 210093,China

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国家重点研发计划国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金

2023YFA14065002022YFA14027002021YFA1400400121340201237415612104503120611310041222540712074174

2024

10.1088/1674-1056/ad3dce

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
年,卷(期)：2024.33(6)
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