Pressurized phase transition cascade in BaMn$_2$P$_2$ and BaMn$_2$As$_2$
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916277665136640 |
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| author | Pavlov, N. S. Shein, I. R. Nekrasov, I. A. |
| author_facet | Pavlov, N. S. Shein, I. R. Nekrasov, I. A. |
| contents | The structural analogue of iron-based superconductors the BaMn$_2$P$_2$ and BaMn$_2$As$_2$ compounds under hydrostatic pressure upto 140 GPa were studied within the framework of DFT+U. The transition from an antiferromagnetic (AFM) insulator to an antiferromagnetic metal is observed under pressure of 6.4 GPa for BaMn$_2$P$_2$ and 8.3 GPa for BaMn$_2$As$_2$. This second order phase transition to the AFM metallic state provides an appropriate normal state for possible superconductivity in these materials. Moreover, a further increase in pressure leads to a series of first order magnetostructural phase transitions between different antiferromagnetic phases, then to a ferromagnetic metal and finally to a nonmagnetic metal. In case of doping these compounds could potentially be a superconductors under pressure (above 6-8 GPa) with critical temperature growing under pressure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_03904 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pressurized phase transition cascade in BaMn$_2$P$_2$ and BaMn$_2$As$_2$ Pavlov, N. S. Shein, I. R. Nekrasov, I. A. Superconductivity Materials Science The structural analogue of iron-based superconductors the BaMn$_2$P$_2$ and BaMn$_2$As$_2$ compounds under hydrostatic pressure upto 140 GPa were studied within the framework of DFT+U. The transition from an antiferromagnetic (AFM) insulator to an antiferromagnetic metal is observed under pressure of 6.4 GPa for BaMn$_2$P$_2$ and 8.3 GPa for BaMn$_2$As$_2$. This second order phase transition to the AFM metallic state provides an appropriate normal state for possible superconductivity in these materials. Moreover, a further increase in pressure leads to a series of first order magnetostructural phase transitions between different antiferromagnetic phases, then to a ferromagnetic metal and finally to a nonmagnetic metal. In case of doping these compounds could potentially be a superconductors under pressure (above 6-8 GPa) with critical temperature growing under pressure. |
| title | Pressurized phase transition cascade in BaMn$_2$P$_2$ and BaMn$_2$As$_2$ |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2406.03904 |