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Quantum spin liquid (QSL) is a novel state of matter which refuses theconventional spin freezing even at 0 K. Experimentally searching for thestructurally perfect candidates is a big challenge in condensed matter physics.Here we report the successful synthesis of a new spin-1/2 triangularantiferromagnet YbMgGaO$_4$ with R$\bar{3}$m symmetry. The compound with anideal two-dimensional and spatial isotropic magnetic triangular-lattice has nosite-mixing magnetic defects and no antisymmetric Dzyaloshinsky-Moriya (DM)interactions. No spin freezing down to 60 mK (despite $\Theta$$_w$ $\sim$ -4K), the low-T power-law temperature dependence of heat capacity and nonzerosusceptibility suggest that YbMgGaO$_4$ is a promising gapless ($\leq$$|$$\Theta$$_w$$|$/100) QSL candidate. The residual spin entropy, which isaccurately determined with a non-magnetic reference LuMgGaO$_4$, approacheszero ($<$ 0.6 \%). This indicates that the possible QSL ground state (GS) ofthe frustrated spin system has been experimentally achieved at the lowestmeasurement temperatures.

Gapless quantum spin liquid ground state in the two-dimensional spin-1/2 triangular antiferromagnet YbMgGaO$_4$