To capture the high-field magnetization process of herbertsmithite ${[\mathrm{ZnCu}}_3{\left(\mathrm{OH}\right)}_6{\mathrm{Cl}}_2]$, Faraday rotation (FR) measurements were carried out on a single crystal in magnetic fields of up to 190 T. The magnetization data evaluated from the FR angle exhibited a saturation behavior above 150 T at low temperatures, which was attributed to the 1/3 magnetization plateau. The overall behavior of the magnetization process was reproduced by theoretical models based on the nearest-neighbor Heisenberg model. This suggests that herbertsmithite is a proximate kagome antiferromagnet hosting an ideal quantum spin liquid in the ground state. A distinguishing feature is the superlinear magnetization increase, which is in contrast to the Brillouin function-type increase observed by conventional magnetization measurements and indicates a reduced contribution from free spins located at the Zn sites to the FR signal.

中文翻译：

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通过超高磁场法拉第旋转在kagome反铁磁体黑铁矿中观察到的磁化高原

捕获铁矾土的高磁场磁化过程 ${[\mathrm{锌铜}}_3{（哦）}_6{氯}_2]$，法拉第旋转（FR）测量在高达190 T的磁场中对单晶进行。从FR角评估的磁化数据在低温下表现出高于150 T的饱和行为，这归因于1/3磁化高原。磁化过程的整体行为由基于最近邻居海森堡模型的理论模型重现。这表明，铁矾石是一种近邻的kagome反铁磁体，在基态上具有理想的量子自旋液体。一个显着的特征是超线性磁化强度的增加，这与常规磁化强度测量所观察到的布里渊函数类型的增加相反，并且表明位于Zn位置的自由自旋对FR信号的贡献减少。