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In this paper, we performed thermodynamic and electron spin resonance (ESR)measurements to study low-energy magnetic excitations, which were significantlyaffected by crystalline electric field (CEF) excitations due to relativelysmall gaps between the CEF ground state and the excited states. Based on theCEF and mean-field (MF) theories, we analyzed systematically and consistentlythe ESR experiments and thermodynamic measurements including susceptibility,magnetization, and heat capacity. The CEF parameters were successfullyextracted by fitting high-temperature (> 20 K) susceptibilities in the ab-planeand along the c-axis, allowing to determine the Lande factors ($g_{ab,calc}$ =5.98(7) and $g_{c,calc}$ = 2.73(3)). These values were consistent with thevalues of Lande factors determined by ESR experiments ($g_{ab,exp}$ = 5.69 and$g_{c,exp}$ = 2.75). By applying the CEF and MF theories to the susceptibilityand magnetization results, we estimated the anisotropic spin-exchange energiesand found that the CEF excitations in \ce{KErTe2} played a decisive role in themagnetism above 3 K, while the low-temperature magnetism below 10 K wasgradually correlated with the anisotropic spin-exchange interactions. The CEFexcitations were demonstrated in the low-temperature heat capacity, where boththe positions of two broad peaks and their magnetic field dependence wellcorroborated our calculations. The present study provides a basis to explorethe enriched magnetic and electronic properties of the QSL family.

Effects of the Crystalline Electric Field in the $KErTe_{2}$ Quantum Spin Liquid Candidate