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

doi:10.1103/PhysRevMaterials.6.064405

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

Strongly Correlated Electrons 2022-06-09 v1

Authors: 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.

Keywords

honeycomb magnet smi3 kramers doublet spin-orbit coupling antiferromagnetic correlations kitaev material

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@article{arxiv.2206.03628,
  title  = {SmI3: 4f5 honeycomb magnet with spin-orbital entangled {\Gamma}7 Kramers doublet},
  author = {Hajime Ishikawa and Ryosuke Kurihara and Takeshi Yajima and Daisuke Nishio-Hamane and Yusei Shimizu and Toshiro Sakakibara and Akira Matsuo and Koichi Kindo},
  journal= {arXiv preprint arXiv:2206.03628},
  year   = {2022}
}

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16 pages, 8 figures

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

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