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Complex systems with coexisting polarity, chirality and incommensuratemagnetism are of great interest because they open new degrees of freedom ininteraction between different subsystems and therefore they host a plethora ofintriguing physical properties. Here we report on optical properties andlattice and spin dynamics of Ni$_2$InSbO$_6$ single crystals studied with theuse of polarized optical microscopy and micro-Raman spectroscopy in thetemperature range 10-300 K. Ni$_2$InSbO$_6$ crystallizes in a polar structuredescribed by the noncentrosymmetric space group R3 and two types of structuraldomains were visualized due to natural optical activity of opposite chirality.Raman tensor elements of most A and E phonons along with their symmetry weredetermined. The manifestation of LO-TO splitting was observed for the A modes.By tracking the temperature dependencies of phonon frequencies the wellpronounced spin-phonon interaction was observed for several modes below andabove the N\'eel transition temperature TN = 76 K. In antiferromagnetic phase awide excitation centred at 247 cm-1 was detected and assigned to the two-magnonmode and this value was used for estimating exchange parameters through linearspin-wave theory calculations.

Lattice and magnetic dynamics in polar chiral incommensurate antiferromagnet Ni$_2$InSbO$_6$