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Pursuing the exotic quantum spin liquid (QSL) state in the Kitaev material$\alpha$-RuCl$_3$ has intrigued great research interest recently. A fascinatingquestion is on the possible existence of field-induced QSL phase in thiscompound. Here we perform a high-field measurement of the magnetization processof $\alpha$-RuCl$_3$ up to 102 T employing the non-destructive and destructivepulsed magnets. Under the out-of-plane field along the c$^*$ axis (i.e.,perpendicular to the honeycomb plane), two quantum phase transitions areuncovered at respectively 36 T and about 83 T, between which there lies anintermediate phase as the predicted QSL. By measuring the magnetization datawith fields tilted from the c$^*$ axis up to $90^\circ$ (i.e., in-planedirection), we obtain the field-angle phase diagram that contains the zigzag,paramagnetic, and QSL phases. Based on the accurate$K$-$J$-$\Gamma$-$\Gamma^{\prime}$ model of $\alpha$-RuCl$_3$, we performdensity matrix renormalization group simulations and reproduce the quantumphase diagram in excellent agreement with experiments.

Possible Intermediate Quantum Spin Liquid Phase in $\alpha$-RuCl$_3$ under High Magnetic Fields up to 100 T