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Na$_{4-\delta}$NiTeO$_{6}$ is a rare example in the transition-metaltellurate family of realizing an $S$ = 1 spin-chain structure. By performingneutron powder diffraction measurements, the ground-state magnetic structure ofNa$_{4-\delta}$NiTeO$_{6}$ is determined. These measurements reveal that below$T\rm_{N}$ ${\sim}$ 6.8(2) K, the Ni$^{2+}$ moments form a screwedferromagnetic (FM) spin-chain structure running along the crystallographic $a$axis but these FM spin chains are coupled antiferromagnetically along the $b$and $c$ directions, giving rise to a magnetic propagation vector of $k$ = (0,1/2, 1/2). This zigzag magnetic order is well supported by first-principlescalculations. The moment size of Ni$^{2+}$ spins is determined to be 2.1(1)$\mu$$\rm_{B}$ at 3 K, suggesting a significant quenching of the orbital momentdue to the crystalline electric field (CEF) effect. The previously reportedmetamagnetic transition near $H\rm_{C}$ ${\sim}$ 0.1 T can be understood as afield-induced spin-flip transition. The relatively easy tunability of thedimensionality of its magnetism by external parameters makesNa$_{4-\delta}$NiTeO$_{6}$ a promising candidate for further exploring varioustypes of novel spin-chain physics.

Zigzag magnetic order in a novel tellurate compound Na$_{4-\delta}$NiTeO$_{6}$ with $\mathit{S}$ = 1 chains