Spin correlations in the S = 1 armchair chain Ni_(2)NbBO_(6) as seen from NMR  

作　　者：Kai-Yue Zeng Long Ma Long-Meng Xu Zhao-Ming Tian Lang-Sheng Ling Li Pi 曾凯悦;马龙;徐龙猛;田召明;凌浪生;皮雳(Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China;Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China;School of Physics and Wuhan National High Magnetic Field Center,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China [2]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [3]School of Physics and Wuhan National High Magnetic Field Center,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Chinese Physics B》2021年第4期512-517,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0401802);the National Natural Science Foundation of China(Grant Nos.11874057,11504377,11574288,11874158,U1732273,and 21927814);the Users with Excellence Program of Hefei Science Center CAS(Grant No.2019HSC-UE008);supported by the High Magnetic Field Laboratory of Anhui Province。

摘　　要：We report our nuclear magnetic resonance(NMR) study on the structurally spin chain compound Ni_(2)NbBO_(6) with complex magnetic coupling.The antiferromagnetic transition is monitored by the line splitting resulting from the staggered internal hyperfine field.The magnetic coupling configuration proposed by the first-principle density functional theory(DFT) is supported by NMR spectral analysis.For the spin dynamics,a prominent peak at T~35 K well above the Neel temperature(T_(N)~20 K at μ0 H=10 T) is observed from the spin-lattice relaxation data.As compared with the dc-susceptibility,this behavior indicates an antiferromagnetic coupling with the typical energy scale of ~3 meV.Thus,the Ni_(2)NbBO_(6) compound can be viewed as strongly ferromagnetically coupled armchair spin chains along the crystalline b-axis.These facts place strong constraints on the theoretical model for this compound.

关 键 词：low-dimensional quantum magnetism magnetic coupling spin excitations nuclear magnetic resonance 

分 类 号：TQ138.13[化学工程—无机化工]