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PreprintCC BY 4.0arXiv

Contrasting Crystal-Field and Dipolar Anisotropies in the Triangular Antiferromagnet NaBaEr(BO3)2

  • Cheng Su
  • Yonglin Wang
  • Zihang Gao
  • Xinyang Liu
  • Jianglong Zhang
  • Chin-Wei Wang
  • Michael Marek Koza
  • Juping Xu
  • Wen Yin
  • Hao Deng
  • Wei Li
  • Junsen Xiang
1 more authors
  • Wentao Jin
Open at sourcePDFDOICite

Abstract

The magnetic ground states of rare-earth frustrated magnets can be governed by competing energy scales arising from crystal-field anisotropy, exchange interactions, and long-range dipolar interactions. Here we investigate this interplay in the triangular-lattice antiferromagnet NaBaEr(BO3)2 by combining magnetization, specific heat, and neutron scattering measurements. Neutron powder diffraction resolves rotations of the ErO6 octahedra and supports the lower-symmetry R3̅ structure over the previously proposed R3̅m model. Magnetization measurements and inelastic neutron scattering establish an effective spin-1/2 description of its low-temperature magnetism with pronounced easy-axis anisotropy, arising from a well-isolated Kramers ground-state doublet separated from the first excited crystal-electric-field level by approximately 4 meV. Below TN=0.1 K, single-crystal neutron diffraction reveals A-type antiferromagnetic order with the ordered moment predominantly oriented within the ab plane, despite the pronounced paramagnetic easy-axis anisotropy. The estimated dipolar interaction scale is comparable to TN, and classical dipolar-energy calculations for the observed stacking pattern favor an in-plane moment orientation. These results reveal contrasting crystal-field and dipolar anisotropies in determining the magnetic ground state of NaBaEr(BO3)2.

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Cite

BibTeXRIS
BibTeX
@misc{su2026contrasting,
  title = {{Contrasting Crystal-Field and Dipolar Anisotropies in the Triangular Antiferromagnet NaBaEr(BO$_3$)$_2$}},
  author = {Cheng Su and Yonglin Wang and Zihang Gao and Xinyang Liu and Jianglong Zhang and Chin-Wei Wang and Michael Marek Koza and Juping Xu and Wen Yin and Hao Deng and Wei Li and Junsen Xiang and Wentao Jin},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.28041},
  eprint = {2610.28041},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.28041},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Contrasting Crystal-Field and Dipolar Anisotropies in the Triangular Antiferromagnet NaBaEr(BO_3)_2
AU  - Cheng Su
AU  - Yonglin Wang
AU  - Zihang Gao
AU  - Xinyang Liu
AU  - Jianglong Zhang
AU  - Chin-Wei Wang
AU  - Michael Marek Koza
AU  - Juping Xu
AU  - Wen Yin
AU  - Hao Deng
AU  - Wei Li
AU  - Junsen Xiang
AU  - Wentao Jin
PY  - 2026
DA  - 2026/10/20
PB  - arXiv
DO  - 10.48550/arxiv.2610.28041
UR  - https://arxiv.org/abs/2610.28041
AB  - The magnetic ground states of rare-earth frustrated magnets can be governed by competing energy scales arising from crystal-field anisotropy, exchange interactions, and long-range dipolar interactions. Here we investigate this interplay in the triangular-lattice antiferromagnet NaBaEr(BO_3)_2 by combining magnetization, specific heat, and neutron scattering measurements. Neutron powder diffraction resolves rotations of the ErO_6 octahedra and supports the lower-symmetry R3̅ structure over the previously proposed R3̅m model. Magnetization measurements and inelastic neutron scattering establish an effective spin-1/2 description of its low-temperature magnetism with pronounced easy-axis anisotropy, arising from a well-isolated Kramers ground-state doublet separated from the first excited crystal-electric-field level by approximately 4 meV. Below T_N=0.1 K, single-crystal neutron diffraction reveals A-type antiferromagnetic order with the ordered moment predominantly oriented within the ab plane, despite the pronounced paramagnetic easy-axis anisotropy. The estimated dipolar interaction scale is comparable to T_N, and classical dipolar-energy calculations for the observed stacking pattern favor an in-plane moment orientation. These results reveal contrasting crystal-field and dipolar anisotropies in determining the magnetic ground state of NaBaEr(BO_3)_2.
ER  -