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$\alpha$-RuCl$_3$ is a leading candidate material for theobservation ofphysics related to the Kitaev quantum spin liquid (QSL). By combinedsusceptibility, specific-heat, and nuclear-magnetic-resonance measurements, wedemonstrate that $\alpha$-RuCl$_3$ undergoes a quantum phase transition to aQSL in a magnetic field of 7.5 T applied in the $ab$ plane. We show furtherthat this high-field QSL phase has gapless spin excitations over a field rangeup to 16 T. This highly unconventional result, unknown in either Heisenberg orKitaev magnets, offers insight essential to establishing the physics of$\alpha$-RuCl$_3$.

Gapless Spin Excitations in the Field-Induced Quantum Spin Liquid Phase of alpha-RuCl3