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In this paper we report the synthesis, magnetization and heat capacity of thefrustrated magnets \emph{A}ErSe$_2$(\emph{A}=Na,K) which contain perfecttriangular lattices of Er$^{3+}$. The magnetization data suggests no long-rangemagnetic order exists in \emph{A}ErSe$_2$(\emph{A}=Na,K), which is consistentwith the heat capacity measurements. Large anisotropy is observed between themagnetization within the \emph{ab} plane and along the \emph{c} axis of bothcompounds. When the magnetic field is applied along \emph{ab} plane, anomaliesare observed at 1.8 $\mu_B$ in NaErSe$_2$ at 0.2 T and 2.1 $\mu_B$ in KErSe$_2$at 0.18 T. Unlike NaErSe$_2$, a plateau-like field-induced metamagnetictransition is observed for H$\|$\emph{c} below 1 K in KErSe$_2$. Two broadpeaks are observed in the heat capacity below 10 K indicating possible crystalelectric field(CEF) effects and magnetic entropy released under differentmagnetic fields. All results indicate that \emph{A}ErSe$_2$ are stronglyanisotropic, frustrated magnets with field-induced transition at lowtemperature. The lack of signatures for long-range magnetic order implies thatthese materials are candidates for hosting a quantum spin liquid ground state.

Synthesis, magnetization and heat capacity of triangular lattice materials NaErSe$_2$ and KErSe$_2$