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To capture the high-field magnetization process of herbertsmithite(ZnCu3(OH)6Cl2), Faraday rotation (FR) measurements were carried out on asingle crystal in magnetic fields of up to 190 T. The magnetization dataevaluated from the FR angle exhibited a saturation behavior above 150 T at lowtemperatures, which was attributed to the 1/3 magnetization plateau. Theoverall behavior of the magnetization process was reproduced by theoreticalmodels based on the nearest-neighbor Heisenberg model. This suggests thatherbertsmithite is a proximate kagome antiferromagnet hosting an ideal quantumspin liquid in the ground state. A distinguishing feature is the superlinearmagnetization increase, which is in contrast to the Brillouin function-typeincrease observed by conventional magnetization measurements and indicates areduced contribution from free spins located at the Zn sites to the FR signal.

Magnetization Plateau Observed by Ultra-High Field Faraday Rotation in a Kagom\'e Antiferromagnet Herbertsmithite