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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2026
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| Online-Zugang: | https://arxiv.org/abs/2604.21561 |
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| _version_ | 1866915951842164736 |
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| author | Radevych, Danylo Roig, Mercè Agterberg, Daniel F. Mazin, Igor I. |
| author_facet | Radevych, Danylo Roig, Mercè Agterberg, Daniel F. Mazin, Igor I. |
| contents | Recent experiments found superconductivity in nonmagnetic MnB$_4$ with a high critical temperature ($T_{c}$) reaching 14 K at 158 GPa. However, ab initio calculations of the electron-phonon coupling predict a $T_{c}$ below 1 K, suggesting that a conventional mechanism cannot explain this phenomenon. In this Letter, we find that MnB$_4$ is close to an altermagnetic instability in density-functional theory calculations. We propose that the superconductivity is driven by altermagnetic spin fluctuations. To verify the pairing symmetry, we have constructed a two-orbital tight-binding model, where boron states at the Fermi level are integrated out. Using this model, we identify an extended-$s$ symmetry as the leading pairing instability. If confirmed, this will be the first reported case of superconductivity driven by altermagnetic spin fluctuations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21561 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Superconductivity induced by altermagnetic spin fluctuations in high-pressure MnB$_4$ Radevych, Danylo Roig, Mercè Agterberg, Daniel F. Mazin, Igor I. Superconductivity Recent experiments found superconductivity in nonmagnetic MnB$_4$ with a high critical temperature ($T_{c}$) reaching 14 K at 158 GPa. However, ab initio calculations of the electron-phonon coupling predict a $T_{c}$ below 1 K, suggesting that a conventional mechanism cannot explain this phenomenon. In this Letter, we find that MnB$_4$ is close to an altermagnetic instability in density-functional theory calculations. We propose that the superconductivity is driven by altermagnetic spin fluctuations. To verify the pairing symmetry, we have constructed a two-orbital tight-binding model, where boron states at the Fermi level are integrated out. Using this model, we identify an extended-$s$ symmetry as the leading pairing instability. If confirmed, this will be the first reported case of superconductivity driven by altermagnetic spin fluctuations. |
| title | Superconductivity induced by altermagnetic spin fluctuations in high-pressure MnB$_4$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2604.21561 |