Magnetic compounds with noncentrosymmetric chiral crystal structures and spin-frustrated lattices often exhibit complex magnetic ordering and coupled responses. In this report, we present a comprehensive study of the chiral and triangular lattice magnetic system ${\mathrm{Ni}}_2{\mathrm{ScSbO}}_6$, which exhibits an incommensurate noncollinear helical antiferromagnetic long-range ordering at a temperature of $T_N=62\mathrm{K}$, as revealed by bulk magnetization, specific heat, and neutron diffraction studies. The onset of this magnetic ordering is closely linked to a series of strongly coupled phenomena occurring at $T_N$. A clear dielectric anomaly in the form of a sharp $\lambda$-like peak is observed at $T_N$, triggered by an isostructural distortion, which is mediated by the magnetostriction effect in this system, as evidenced by our synchrotron x-ray diffraction studies. Moreover, a clear anomalous phonon softening for various Raman modes is observed at $T_N$, which can be attributed to substantial spin-phonon coupling combined with the influence of magnetostriction effects. All these strongly correlated phenomena, occurring concurrently with the emergence of the helical antiferromagnetic order, demonstrate an entangled behavior of various microscopic degrees of freedom in this system, thus highlighting ${\mathrm{Ni}}_2{\mathrm{ScSbO}}_6$ as a unique material.

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• Dielectric properties
• Lattice dynamics
• Magnetic coupling
• Magnetic phase transitions
• Magnetic susceptibility
• Magnetism
• Magneto-dielectric effect
• Magnetostriction
• Spin dynamics
• Spin-phonon coupling
• Structural properties
• Perovskites
• Transition metal oxides