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

Abstract

In this paper we report the synthesis, magnetization and heat capacity of the frustrated magnets \emph{A}ErSe${}_2$(\emph{A}=Na,K) which contain perfect triangular lattices of Er${}^{3+}$. The magnetization data suggests no long-range magnetic order exists in \emph{A}ErSe${}_2$(\emph{A}=Na,K), which is consistent with the heat capacity measurements. Large anisotropy is observed between the magnetization within the \emph{ab} plane and along the \emph{c} axis of both compounds. When the magnetic field is applied along \emph{ab} plane, anomalies are 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 metamagnetic transition is observed for H$\Vert$\emph{c} below 1 K in KErSe${}_2$. Two broad peaks are observed in the heat capacity below 10 K indicating possible crystal electric field(CEF) effects and magnetic entropy released under different magnetic fields. All results indicate that \emph{A}ErSe${}_2$ are strongly anisotropic, frustrated magnets with field-induced transition at low temperature. The lack of signatures for long-range magnetic order implies that these materials are candidates for hosting a quantum spin liquid ground state.

arXiv comment7 pages, 4 figures

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