The Yb-based triangular lattice delafossites $A\mathrm{Yb}{X}_2$ ($A=\text{alkali}$ metal, $X=\text{O}$, S, Se) have recently been studied as quantum spin liquid candidates. We report the synthesis of powders and single crystals of ${\mathrm{CuYbSe}}_2$ with a perfect triangular lattice of ${\mathrm{Yb}}^{3+}$ moments. Magnetic susceptibility and heat capacity measurements reveal no evidence of long-range magnetic ordering down to 1.8 K in spite of a significant antiferromagnetic exchange between ${\mathrm{Yb}}^{3+}$ moments, suggesting a frustrated magnetic system. Electrical resistivity measurements indicate insulating behavior, consistent with the localized nature of magnetic moments. Heat capacity reveals that ${\mathrm{CuYbSe}}_2$ can be treated as an effective spin $S=1/2$ triangular lattice antiferromagnet below $\sim 50$ K. Magnetic susceptibility measurements on single crystals reveal weak magnetic anisotropy. These properties position ${\mathrm{CuYbSe}}_2$ as another platform for exploring exotic magnetic ground states in triangular lattice systems.

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• Frustrated magnetism
• Quantum spin liquid
• Magnetic insulators
• Mott insulators
• Triangular lattice