Scientists Capture a New Polar Orders: True Ferrielectric Material Discovered (IMAGE)
Caption
Polarization in (MV)[SbBr5] arises from two contributions: Br displacements within the inorganic [SbBr5]2- framework and the concerted displacement of the organic MV cations. These form non-collinear, nearly antiparallel dipolar sublattices of unequal magnitude and produce a stepwise field-driven switching: at low fields, the net polarization reverses without flipping individual dipoles; at intermediate fields, the organic sublattice undergoes an AFE→FE transition; at higher fields, the inorganic sublattice follows—yielding multi-peak I–E/C–E signatures. The electric-field-induced polar-to-polar transition (FiE→FE) enables field tuning of spin–orbit coupling (SOC), manifested as a voltage-controllable circular photogalvanic effect (CPGE).
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