Abstract
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 ${\text{CuCrO}}_{2}$. We observed that one of the resonance modes showed a discontinuous change around 5.3 T for $H\ensuremath{\parallel}[1\overline{1}0]$, 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.
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