NMR study of the spin correlations in the $S=1$ armchair chain Ni$_2$NbBO$_6$

K. Y. Zeng; Long Ma; L. M. Xu; Z. M. Tian; L. S. Ling; Li Pi

doi:10.1088/1674-1056/abc2b5

paper

NMR study of the spin correlations in the $S = 1$ armchair chain Ni $_{2}$ NbBO $_{6}$

arXiv:2008.01949 · doi:10.1088/1674-1056/abc2b5

Abstract

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 our NMR spectral analysis. For the spin dynamics, a prominent peak at $T \sim 35$ K well above the Néel temperature ( $T_{N} \sim 20$ K at $μ_{0} H = 10$ T) is observed from the spin-lattice relaxation data. As compared with the dc-susceptibility, this behavior indicates a antiferromagnetic coupling with the typical energy scale of $\sim 3$ 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 to the theoretical model for this compound.

arXiv comment6 pages, 4 figures

NMR study of the spin correlations in the S=1 armchair chain Ni2​NbBO6​

Abstract

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NMR study of the spin correlations in the $S = 1$ armchair chain Ni $_{2}$ NbBO $_{6}$