Crystal-Field Symmetry Constraints in Layered Honeycomb ErBr$_3$
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915962018594816 |
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| author | Hu, Biaoyan Hu, Mingyuan Demmel, Franz Podlesnyak, Andrey A. He, Jiaqing Wu, Liusuo |
| author_facet | Hu, Biaoyan Hu, Mingyuan Demmel, Franz Podlesnyak, Andrey A. He, Jiaqing Wu, Liusuo |
| contents | We show that the local crystal-field symmetry of ErBr$_3$ enforces $\langle ψ_\pm | J^{\pm} | ψ_\mp \rangle = 0$ within the ground-state Kramers doublet, thereby removing the lowest-order transverse channel from the low-energy sector. Thermodynamic measurements reveal two zero-field anomalies. Under an in-plane magnetic field, the thermodynamic response separates into a phase boundary and a broader crossover line. Consistently, inelastic neutron scattering measurements above the ordering temperature reveal no well-defined low-energy dispersive magnetic modes. These results show that the crystal-field ground-state symmetry strongly constrains the low-energy dynamics and provides a natural framework for understanding the field-dependent thermodynamic response of ErBr$_3$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_24951 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Crystal-Field Symmetry Constraints in Layered Honeycomb ErBr$_3$ Hu, Biaoyan Hu, Mingyuan Demmel, Franz Podlesnyak, Andrey A. He, Jiaqing Wu, Liusuo Strongly Correlated Electrons We show that the local crystal-field symmetry of ErBr$_3$ enforces $\langle ψ_\pm | J^{\pm} | ψ_\mp \rangle = 0$ within the ground-state Kramers doublet, thereby removing the lowest-order transverse channel from the low-energy sector. Thermodynamic measurements reveal two zero-field anomalies. Under an in-plane magnetic field, the thermodynamic response separates into a phase boundary and a broader crossover line. Consistently, inelastic neutron scattering measurements above the ordering temperature reveal no well-defined low-energy dispersive magnetic modes. These results show that the crystal-field ground-state symmetry strongly constrains the low-energy dynamics and provides a natural framework for understanding the field-dependent thermodynamic response of ErBr$_3$. |
| title | Crystal-Field Symmetry Constraints in Layered Honeycomb ErBr$_3$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.24951 |