Magnetic properties of layered CsNdSe₂ with triangular lattice

The family of rare-earth triangular lattice materials ARCh₂ (A: alkali metal, Cu, Ag; R: rare earth, Ch: chalcogen) attracts great attention due to its rich magnetism. We have successfully synthesized CsNdSe₂ single crystals by the salt flux. The crystal structure consists of perfect Nd triangular lattice without distortions. Its AC and DC magnetic susceptibility has been measured with a field applied along different directions down to 0.05 K. By fitting the magnetic susceptibility from 200 K to 300 K using the Curie-Weiss law, we obtain Curie-Weiss temperature -4.5 K and -88 K, revealing weak antiferromagnetic interactions in CsNdSe₂. The AC susceptibility at zero DC field shows a downturn below 0.5 K, suggesting short-range AFM correlations. The absence of long-range magnetic ordering suggests possible spin liquid formation in CsNdSe₂.