Antiferroically ordered electric toroidal dipole moments act as the order parameter for antiferroaxial rotations that produce chirality in BaTiOCu4(PO4)4, with overall chirality given by the composite of antipolar electric dipoles and toroidal dipoles.
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Chirality in BaTiOCu$_4$(PO$_4$)$_4$
Antiferroically ordered electric toroidal dipole moments act as the order parameter for antiferroaxial rotations that produce chirality in BaTiOCu4(PO4)4, with overall chirality given by the composite of antipolar electric dipoles and toroidal dipoles.