Applied-field magnetic structure and spectroscopy shifts of the effective spin-$\frac{1}{2}$, $XY$-like magnet Li$_2$CoCl$_4$
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915479742840832 |
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| author | Riedel, Zachary W. Ozerov, Mykhaylo Calder, Stuart Shoemaker, Daniel P. |
| author_facet | Riedel, Zachary W. Ozerov, Mykhaylo Calder, Stuart Shoemaker, Daniel P. |
| contents | Insulators containing chains of magnetic transition metal cations provide platforms for probing spin-$\frac{1}{2}$ dynamics and quantum critical behavior. Li$_2$CoCl$_4$ contains edge-sharing CoCl$_6$ octahedra that form chains along the crystallographic $c$ axis and orders antiferromagnetically at zero field, but questions remain about its applied-field magnetic structure and the Co$^{2+}$ spin state. Here, we show with neutron diffraction on a polycrystalline sample how the anti-aligned chains of cobalt moments begin to transition to a ferromagnetic state above 1.6 T. Further, using magnetic resonance absorption measurements and noninteracting spin models, we reveal the strongly anisotropic nature of the Co$^{2+}$ ion's $XY$-like magnetic behavior ($g_{\parallel}=2.77$ and $g_{\perp}=5.23$) and its $J=\frac{1}{2}$ ground state. We, therefore, supply the magnetic structures and anisotropic description needed to explore the dynamics of the field-driven magnetic phases, laying the foundation for further experimental and theoretical studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_05101 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Applied-field magnetic structure and spectroscopy shifts of the effective spin-$\frac{1}{2}$, $XY$-like magnet Li$_2$CoCl$_4$ Riedel, Zachary W. Ozerov, Mykhaylo Calder, Stuart Shoemaker, Daniel P. Strongly Correlated Electrons Materials Science Insulators containing chains of magnetic transition metal cations provide platforms for probing spin-$\frac{1}{2}$ dynamics and quantum critical behavior. Li$_2$CoCl$_4$ contains edge-sharing CoCl$_6$ octahedra that form chains along the crystallographic $c$ axis and orders antiferromagnetically at zero field, but questions remain about its applied-field magnetic structure and the Co$^{2+}$ spin state. Here, we show with neutron diffraction on a polycrystalline sample how the anti-aligned chains of cobalt moments begin to transition to a ferromagnetic state above 1.6 T. Further, using magnetic resonance absorption measurements and noninteracting spin models, we reveal the strongly anisotropic nature of the Co$^{2+}$ ion's $XY$-like magnetic behavior ($g_{\parallel}=2.77$ and $g_{\perp}=5.23$) and its $J=\frac{1}{2}$ ground state. We, therefore, supply the magnetic structures and anisotropic description needed to explore the dynamics of the field-driven magnetic phases, laying the foundation for further experimental and theoretical studies. |
| title | Applied-field magnetic structure and spectroscopy shifts of the effective spin-$\frac{1}{2}$, $XY$-like magnet Li$_2$CoCl$_4$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2503.05101 |