Rare-earth triangular lattices provide an ideal platform for exploring novel quantum magnetic states. Here, we report the crystal growth and magnetic properties of a rare-earth triangular-lattice compound, ${\mathrm{ErZn}}_3{\mathrm{P}}_3$. Alternating-current magnetic susceptibility and specific heat measurements reveal a long-range antiferromagnetic order below $T=0.12\mathrm{K}$. The long-range magnetic order can be rapidly suppressed by a small magnetic field of ${\mu }_{0}H=0.04\mathrm{T}$ along the $c$ axis, followed by a broad field-induced anomaly above 0.05 T that shifts to higher temperatures as the magnetic field increases. The magnetic entropy release below 2 K is estimated to be $0.852\left(42\right)Rln2$, which is consistent with a Kramers doublet described by an effective spin $S=1/2$. Finally, a magnetic field-temperature contour map is constructed based on the specific heat results. Our work identifies a long-range yet fragile magnetic order in this newly grown $S=1/2$ quantum magnet, and its fragility suggests the presence of strong quantum fluctuations arising from geometric frustrations and quantum spins in ${\mathrm{ErZn}}_3{\mathrm{P}}_3$.

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• Frustrated magnetism
• Magnetic order
• Magnetic phase transitions
• Rare-earth magnetic materials
• Transition-metal rare-earth alloys
• Triangular lattice
• Crystal growth
• Specific heat measurements