  The search of novel quasi one-dimensional (1D) materials is one of the
important aspects in the field of material science. Toroidal moment, the order
parameter of ferrotoroidic order, can be generated by a head-to-tail
configuration of magnetic moment. It has been theoretically proposed that
one-dimensional (1D) dimerized and antiferromagnetic-like spin chain hosts
ferrotoroidicity and has the toroidal moment composed of only two antiparallel
spins. Here, we report a ferrotoroidic candidate of Ba6Cr2S10 with such a
theoretical model of spin chain. The structure consists of unique dimerized
face-sharing CrS6 octahedral chains along the c axis. An antiferromagnetic-like
ordering at ~10 K breaks both space- and time-reversal symmetries and the
magnetic point group of mm'2' allows three ferroic orders in Ba6Cr2S10:
(anti)ferromagnetic, ferroelectric and ferrotoroidic orders. Our investigation
reveals that Ba6Cr2S10 is a rare ferrotoroidic candidate with quasi 1D spin
chain, which can be considered as a starting point for the further exploration
of the physics and applications of ferrotoroidicity.
