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The magnetization process of the breathing pyrochlore magnet CuInCr4S8 hasbeen investigated in ultra-high magnetic fields up to 150 T. Successive phasetransitions characterized with a substantially wide 1/2-plateau from 55 T to110 T are observed in this system, resembling those reported in chromium spineloxides. In addition to the 1/2-plateau phase, the magnetization is found toexhibit two inherent behaviors: a slight change in the slope of the M-H curveat ~ 85 T and a shoulder-like shape at ~ 130 T prior to the saturation. Both ofthem are accompanied by a hysteresis, suggesting first-order transitions. Thetheoretical calculation applicable to CuInCr4S8 is also shown, based on themicroscopic model with the spin-lattice coupling. The calculation fairly wellreproduces the main features of the experimentally observed magnetizationprocess, including a relatively wide cant 2:1:1 phase clearly observed in theprevious work [Y. Okamoto et al., J. Phys. Soc. Jpn. 87, 034709 (2018)]. Therobust 1/2-plateau on CuInCr4S8 seems to be originated from the dominantantiferromagnetic interactions and the strong spin-lattice coupling.

Magnetization process of the breathing pyrochlore magnet CuInCr$_4$S$_8$ in ultra-high magnetic fields up to 150 T