Abstract
The magnetic phases of a triangular-lattice antiferromagnet ${\mathrm{CuCrO}}_{2}$ were investigated in magnetic fields along the $c$ axis, $H\ensuremath{\parallel}[001]$, up to 120 T. Faraday rotation and magnetoabsorption spectroscopy were used to unveil the rich physics of magnetic phases. An up-up-down (UUD) magnetic structure phase was observed around 90--105 T at temperatures around 10 K. Additional distinct anomalies adjacent to the UUD phase were uncovered and the $\mathsf{Y}$-shaped and the $\mathsf{V}$-shaped phases are proposed to be viable candidates. These ordered phases emerged as a result of the interplay of geometrical spin frustration, single-ion anisotropy, and thermal fluctuations in an environment of extremely high magnetic fields.
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