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arXiv · 2206.03628

SmI3: 4f5 honeycomb magnet with spin-orbital entangled {\Gamma}7 Kramers doublet

Hajime Ishikawa·Ryosuke Kurihara·Takeshi Yajima·Daisuke Nishio-Hamane·Yusei Shimizu·Toshiro Sakakibara·Akira Matsuo·Koichi Kindo
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Abstract

We report magnetic properties of a 4f-honeycomb iodide SmI3 made up of edge-shared network of SmI6 octahedra. High temperature magnetic susceptibility indicates {\Gamma}7 Kramers doublet ground state of Sm3+ (4f5) ions stabilized by the spin-orbit coupling and octahedral crystal electric field, which interact with Sm-I-Sm bond angle nearly 90 degree. Magnetization measurements down to 0.1 K detected antiferromagnetic correlations and an anomaly in the magnetization curve before saturation without a sign of long-range order. Relevance between SmI3 and the antiferromagnetic Kitaev material proposed in the 4f-electron system is discussed.

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Hajime Ishikawa, Ryosuke Kurihara, Takeshi Yajima, Daisuke Nishio-Hamane, Yusei Shimizu, Toshiro Sakakibara, Akira Matsuo, Koichi Kindo. 2022-06-08. SmI3: 4f5 honeycomb magnet with spin-orbital entangled {\Gamma}7 Kramers doublet. https://doi.org/10.1103/physrevmaterials.6.064405

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