Spin reorientation in the easy-plane hexagonal antiferromagnet under a canted magnetic field

Abstract

Spin reorientation process in the quasi-one-dimensional easy-plane antiferromagnet on a stacked triangular lattice has been considered theoretically and studied in an experiment on CsMnBr3. The second-order phase transition associated with the flip of two pairs of sublattices has been shown to persist if the magnetic field is canted at an angle phi from the basal plane. The field and angular dependences of the magnetic torques measured at T=1.8 K, although in qualitative agreement with the classical theory, demonstrate a strong effect of quantum fluctuations.