Full-magnetization of geometrically frustrated CdCr2O4 determined by Faraday rotation measurements at magnetic fields up to 140 T

The total magnetization process of CdCr2O4, a prototype of the geometrically frustrated Heisenberg spin system, was revealed by Faraday rotation measurements conducted up to 140 T at a wide range of temperatures. We have shown that the Faraday rotation angle is proportional to the magnetization of the system up to the highest magnetic fields. The magnetization processes were well described by a four sublattice Heisenberg spin model [Penc , Phys. Rev. Lett. 93, 197203 (2004); Motome , J. Magn. Magn. Mater. 300, 57 (2006)] including spin-lattice interactions.