Crystal field splittings and magnetic ground state of the square-lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 with Jeff = 1/2
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Park, Pyeongjae Ma, Qianli Sala, G. Calder, S. Abernathy, Douglas L. Stone, Matthew B. May, Andrew F. Christianson, Andrew D. |
| author_facet | Park, Pyeongjae Ma, Qianli Sala, G. Calder, S. Abernathy, Douglas L. Stone, Matthew B. May, Andrew F. Christianson, Andrew D. |
| contents | We report on the crystal field level splitting and magnetic ground state of the Jeff = 1/2 square lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 using powder inelastic neutron scattering (INS) and neutron diffraction measurements. Both compounds exhibit a well-isolated $Γ_{7}$ doublet ground state under a tetragonal crystal field environment, confirming a robust Jeff = 1/2 picture with slight XY-type anisotropic character in the g-tensor. Notably, the ground state wave functions closely resemble the $Γ_{7}$ doublet expected in the perfect cubic limit, consistent with the nearly cubic ligand configuration of eight O2- ions surrounding Yb3+. Below TN =0.21 K, YbBi2IO4 exhibits a stripe long-range magnetic order characterized by an ordering wave vector qm = (1/2, 0, 0) or its symmetry-equivalent (0, 1/2, 0), with magnetic moments aligned along qm. The ordered moment is approximately 79 % of the classical prediction, significantly larger than expected from the isotropic J1-J2 model, suggesting the possible involvement of exchange anisotropy in explaining this observation. We show that symmetry-allowed XXZ and bond-dependent anisotropic exchange terms in a square lattice can play a critical role in stabilizing the stripe order and suppressing the moment reduction as observed. These findings establish YbBi2ClO4 and YbBi2IO4 as unique platforms for exploring rich Jeff = 1/2 magnetism from two less investigated perspectives: (i) on a square lattice and (ii) within a (nearly) cubic ligand environment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_09739 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Crystal field splittings and magnetic ground state of the square-lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 with Jeff = 1/2 Park, Pyeongjae Ma, Qianli Sala, G. Calder, S. Abernathy, Douglas L. Stone, Matthew B. May, Andrew F. Christianson, Andrew D. Strongly Correlated Electrons Materials Science We report on the crystal field level splitting and magnetic ground state of the Jeff = 1/2 square lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 using powder inelastic neutron scattering (INS) and neutron diffraction measurements. Both compounds exhibit a well-isolated $Γ_{7}$ doublet ground state under a tetragonal crystal field environment, confirming a robust Jeff = 1/2 picture with slight XY-type anisotropic character in the g-tensor. Notably, the ground state wave functions closely resemble the $Γ_{7}$ doublet expected in the perfect cubic limit, consistent with the nearly cubic ligand configuration of eight O2- ions surrounding Yb3+. Below TN =0.21 K, YbBi2IO4 exhibits a stripe long-range magnetic order characterized by an ordering wave vector qm = (1/2, 0, 0) or its symmetry-equivalent (0, 1/2, 0), with magnetic moments aligned along qm. The ordered moment is approximately 79 % of the classical prediction, significantly larger than expected from the isotropic J1-J2 model, suggesting the possible involvement of exchange anisotropy in explaining this observation. We show that symmetry-allowed XXZ and bond-dependent anisotropic exchange terms in a square lattice can play a critical role in stabilizing the stripe order and suppressing the moment reduction as observed. These findings establish YbBi2ClO4 and YbBi2IO4 as unique platforms for exploring rich Jeff = 1/2 magnetism from two less investigated perspectives: (i) on a square lattice and (ii) within a (nearly) cubic ligand environment. |
| title | Crystal field splittings and magnetic ground state of the square-lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 with Jeff = 1/2 |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2503.09739 |