Chiral Critical Exponents of the Triangular-Lattice AntiferromagnetCsMnBr3as Determined by Polarized Neutron Scattering

The critical exponents ${\gamma }_c=0.84\mathrm{}\left(7\right)$ of the chiral susceptibility above the Néel temperature, $T_N$, and ${\beta }_c=0.44\mathrm{}\left(2\right)$ of the average chirality below $T_N$ have been determined for the triangular-lattice antiferromagnet ${\mathrm{CsMnBr}}_3$ by means of polarized neutron scattering. These first experimental values of chiral critical exponents are in line with theoretical predictions and fulfill their scaling relation. The temperature at which the average chirality appears coincides with the spin-order transition temperature, $T_N$.