Magnetic interactions and excitations in SrMnSb$_2$
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913383262978048 |
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| author | Ning, Zhenhua Li, Bing Tang, Weilun Banerjee, Arnab Fanelli, Victor Abernathy, Doug Liu, Yong Ueland, Benjamin G McQueeney, Robert J. Ke, Liqin |
| author_facet | Ning, Zhenhua Li, Bing Tang, Weilun Banerjee, Arnab Fanelli, Victor Abernathy, Doug Liu, Yong Ueland, Benjamin G McQueeney, Robert J. Ke, Liqin |
| contents | The magnetic interactions in the antiferromagnetic (AFM) Dirac semimetal candidate SrMnSb$_2$ are investigated using \textit{ab initio} linear response theory and inelastic neutron scattering (INS). Our calculations reveal that the first two nearest in-plane couplings ($J_1$ and $J_2$) are both AFM in nature, indicating a significant degree of spin frustration, which aligns with experimental observations. The orbital resolution of exchange interactions shows that $J_1$ and $J_2$ are dominated by direct and superexchange, respectively. In a broader context, a rigid-band model suggests that electron doping fills the minority spin channel and results in a decrease in the AFM coupling strength for both $J_1$ and $J_2$. To better compare with INS measurements, we calculate the spin wave spectra within a linear spin wave theory, utilizing the computed exchange parameters. Although the calculated spin wave spectra somewhat overestimate the magnon bandwidth, they exhibit overall good agreement with measurements from INS experiments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_15572 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic interactions and excitations in SrMnSb$_2$ Ning, Zhenhua Li, Bing Tang, Weilun Banerjee, Arnab Fanelli, Victor Abernathy, Doug Liu, Yong Ueland, Benjamin G McQueeney, Robert J. Ke, Liqin Materials Science The magnetic interactions in the antiferromagnetic (AFM) Dirac semimetal candidate SrMnSb$_2$ are investigated using \textit{ab initio} linear response theory and inelastic neutron scattering (INS). Our calculations reveal that the first two nearest in-plane couplings ($J_1$ and $J_2$) are both AFM in nature, indicating a significant degree of spin frustration, which aligns with experimental observations. The orbital resolution of exchange interactions shows that $J_1$ and $J_2$ are dominated by direct and superexchange, respectively. In a broader context, a rigid-band model suggests that electron doping fills the minority spin channel and results in a decrease in the AFM coupling strength for both $J_1$ and $J_2$. To better compare with INS measurements, we calculate the spin wave spectra within a linear spin wave theory, utilizing the computed exchange parameters. Although the calculated spin wave spectra somewhat overestimate the magnon bandwidth, they exhibit overall good agreement with measurements from INS experiments. |
| title | Magnetic interactions and excitations in SrMnSb$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2401.15572 |