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PreprintCC BY 4.0arXiv

Systematic Evolution of Magnetic Anisotropy and Crystal-electric-field Ground States in SmTr2Ge2

  • Ryuji Higashinaka
  • Kokoro Higo
  • Tatsuma D. Matsuda
  • Yuji Aoki
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Abstract

We investigated the crystal-electric-field (CEF) states in SmTr2Ge2 (Tr= Co-Cu and Ag) with the ThCr2Si2-type structure by magnetization and specific heat measurements. The magnetic anisotropy evolves systematically with Tr, changing from an easy ab plane for Tr = Co and Ni to an easy c axis for Tr = Cu and Ag. Combined analyses of the low-temperature susceptibility and magnetic entropy indicate a level crossing of the CEF ground state between Ni and Cu, together with a systematic evolution of the first excited CEF energy. The evolution of the magnetic properties correlates with changes in local structural parameters, providing an experimental basis for discussing how the ligand environment around the Sm ion is related to the 4f electronic state.

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Cite

BibTeXRIS
BibTeX
@misc{higashinaka2026systematic,
  title = {{Systematic Evolution of Magnetic Anisotropy and Crystal-electric-field Ground States in SmTr2Ge2}},
  author = {Ryuji Higashinaka and Kokoro Higo and Tatsuma D. Matsuda and Yuji Aoki},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.30871},
  eprint = {2609.30871},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.30871},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Systematic Evolution of Magnetic Anisotropy and Crystal-electric-field Ground States in SmTr2Ge2
AU  - Ryuji Higashinaka
AU  - Kokoro Higo
AU  - Tatsuma D. Matsuda
AU  - Yuji Aoki
PY  - 2026
DA  - 2026/09/25
PB  - arXiv
DO  - 10.48550/arxiv.2609.30871
UR  - https://arxiv.org/abs/2609.30871
AB  - We investigated the crystal-electric-field (CEF) states in SmTr2Ge2 (Tr= Co-Cu and Ag) with the ThCr2Si2-type structure by magnetization and specific heat measurements. The magnetic anisotropy evolves systematically with Tr, changing from an easy ab plane for Tr = Co and Ni to an easy c axis for Tr = Cu and Ag. Combined analyses of the low-temperature susceptibility and magnetic entropy indicate a level crossing of the CEF ground state between Ni and Cu, together with a systematic evolution of the first excited CEF energy. The evolution of the magnetic properties correlates with changes in local structural parameters, providing an experimental basis for discussing how the ligand environment around the Sm ion is related to the 4f electronic state.
ER  -