We have performed high-field multifrequency electron spin resonance and magnetization measurements in magnetic field H up to about 53 T on single crystals of a multiferroic triangular-lattice antiferromagnet CuCrO2. We observed that one of the resonance modes showed a discontinuous change around 5.3 T for H||[1 1̄ 0], where the system undergoes a first-order phase transition accompanying a remarkable magnetoelectric effect. We explain the observed anomaly quantitatively in terms of the spiral-plane flop, considering a distorted triangular-lattice model with two kinds of antiferromagnetic in-plane exchange interactions and rhombic anisotropy.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 2010 Jan 15