Magnetic interactions and excitations in SrMnSb\(_2\)
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 bot...
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| creator | Ning, Zhenhua Li, Bing Tang, Weilun Banerjee, Arnab Fanelli, Victor Abernathy, Doug Liu, Yong Ueland, Benjamin G McQueeney, Robert J Ke, Liqin |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.2401.15572 |
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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. 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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. 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| subjects | Antiferromagnetism Couplings Electron spin Inelastic scattering Magnons Neutron scattering Neutrons Wave spectra |
| title | Magnetic interactions and excitations in SrMnSb\(_2\) |
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