  We study how spin and orbital effects influence the capability of promoting
Dzyaloshinskii-Moriya (DM) interaction by studying the two magnetic polar
materials, Cu(IO3)2 (S = 1/2 with orbital contribution) and Mn(IO3)2 (S = 5/2
with quenched orbital magnetism) and connecting their electronic and magnetic
properties with their structures. The chemically controlled low-temperature
synthesis of these complexes resulted in pure polycrystalline samples,
providing a viable pathway to prepare bulk forms of transition-metal io-dates.
Rietveld refinements of the powder synchrotron X-ray diffraction data reveal
that these materials exhibit different crystal structures but crystallize in
the same polar and chiral P21 space group, giving rise to an electric
polarization along the b-axis direction. The presence and absence of an evident
phase transition to a possible topologically distinct state observed in
Cu(IO3)2 and Mn(IO3)2, respectively, implies the important role of spin-orbit
coupling. Neutron diffraction experiments reveal helpful insights into the
magnetic ground state of these materials. While the long-wavelength
incommensurability of Cu(IO3)2 is in harmony with orbital effects and
anisotropic magnetic exchange, the commensurate stripe AFM ground state of
Mn(IO3)2 is attributed to quenched orbital angular momentum and isotropic
magnetic coupling. The work demonstrates connections between combined spin and
orbital effects, magnetic coupling dimensionality and DM exchange, providing a
worthwhile approach for tuning asymmetric interaction which promotes evolution
of topologically distinct spin phases.
