NMR study of the spin correlations in the $S=1$ armchair chain Ni$_2$NbBO$_6$
| Autor: | Zeng, K. Y., Ma, Long, Xu, L. M., Tian, Z. M., Ling, L. S., Pi, Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Chin. Phys. B, 30, 047503 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1674-1056/abc2b5 |
| Popis: | 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 $T\sim35$ K well above the N\'{e}el temperature ($T_N\sim20$ K at $\mu_0H=10$ 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 $\sim3$ 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. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|