Pressurized phase transition cascade in BaMn$_2$P$_2$ and BaMn$_2$As$_2$

N. S. Pavlov; I. R. Shein; I. A. Nekrasov

Pressurized phase transition cascade in BaMn$_2$P$_2$ and BaMn$_2$As$_2$

Superconductivity 2024-06-07 v1 Materials Science

Authors: N. S. Pavlov , I. R. Shein , I. A. Nekrasov

Abstract

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.

Keywords

high-pressure phase transitions magnetic phase transitions high-temperature superconductivity

Cite

@article{arxiv.2406.03904,
  title  = {Pressurized phase transition cascade in BaMn$_2$P$_2$ and BaMn$_2$As$_2$},
  author = {N. S. Pavlov and I. R. Shein and I. A. Nekrasov},
  journal= {arXiv preprint arXiv:2406.03904},
  year   = {2024}
}

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5 pages, 5 figures

Pressurized phase transition cascade in BaMn$_2$P$_2$ and BaMn$_2$As$_2$

Abstract

Keywords

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