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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.13635 |
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| _version_ | 1866910034970017792 |
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| author | Deng, Shiyu Coak, Matthew J. Haines, Charles R. S. Hamidov, Hayrullo Lampronti, Giulio I. Jarvis, David M. Zhang, Xiaotian Liu, Cheng Daisenberger, Dominik Warren, Mark R. Hansen, Thomas C Klotz, Stefan Kim, Chaebin Yang, Pengtao Wang, Bosen Cheng, Jinguang Park, Je-Geun Wildes, Andrew R. Saxena, Siddharth S |
| author_facet | Deng, Shiyu Coak, Matthew J. Haines, Charles R. S. Hamidov, Hayrullo Lampronti, Giulio I. Jarvis, David M. Zhang, Xiaotian Liu, Cheng Daisenberger, Dominik Warren, Mark R. Hansen, Thomas C Klotz, Stefan Kim, Chaebin Yang, Pengtao Wang, Bosen Cheng, Jinguang Park, Je-Geun Wildes, Andrew R. Saxena, Siddharth S |
| contents | We report the emergence of a two-dimensional (2D) polar metal phase in van der Waals compound FePSe$_3$ under moderate pressures. This layered material is a Mott insulator with antiferromagnetic order under ambient conditions. We show that FePSe$_3$ uniquely allows tuning a 2D correlated insulator into an exotic metal state where a loss of inversion symmetry leads to periodic polar displacements of ions, within a conducting phase - a polar metal. Our combined synchrotron and neutron diffraction data allow us to present a long-sought, unambiguous high-pressure structural model and show the polar displacements of this new phase. We also observe the suppression of magnetic ordering at the insulator-to-metal transition correspondent with this structural change. Our work outlines a comprehensive temperature-pressure phase diagram of FePSe$_3$, combining detailed structural, magnetic and transport data. The high-pressure phase exhibits activated semiconductor behavior at high temperatures, a $T^2$-dependence in its resistivity at lower temperatures - despite the conditions required for a `good metal' Fermi-Liquid description not being met in this case - and a low-temperature resistivity upturn which is suppressed as the system is tuned away from the concomitant transitions. The realisation of a tunable 2D polar metal state in FePSe$_3$ due to the loss of its inversion symmetry combined with pressure-induced metallicity offers a promising new platform to investigate this exotic phase at accessible pressures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_13635 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergent Polar Metal Phase in a Van der Waals Mott Magnet Deng, Shiyu Coak, Matthew J. Haines, Charles R. S. Hamidov, Hayrullo Lampronti, Giulio I. Jarvis, David M. Zhang, Xiaotian Liu, Cheng Daisenberger, Dominik Warren, Mark R. Hansen, Thomas C Klotz, Stefan Kim, Chaebin Yang, Pengtao Wang, Bosen Cheng, Jinguang Park, Je-Geun Wildes, Andrew R. Saxena, Siddharth S Strongly Correlated Electrons We report the emergence of a two-dimensional (2D) polar metal phase in van der Waals compound FePSe$_3$ under moderate pressures. This layered material is a Mott insulator with antiferromagnetic order under ambient conditions. We show that FePSe$_3$ uniquely allows tuning a 2D correlated insulator into an exotic metal state where a loss of inversion symmetry leads to periodic polar displacements of ions, within a conducting phase - a polar metal. Our combined synchrotron and neutron diffraction data allow us to present a long-sought, unambiguous high-pressure structural model and show the polar displacements of this new phase. We also observe the suppression of magnetic ordering at the insulator-to-metal transition correspondent with this structural change. Our work outlines a comprehensive temperature-pressure phase diagram of FePSe$_3$, combining detailed structural, magnetic and transport data. The high-pressure phase exhibits activated semiconductor behavior at high temperatures, a $T^2$-dependence in its resistivity at lower temperatures - despite the conditions required for a `good metal' Fermi-Liquid description not being met in this case - and a low-temperature resistivity upturn which is suppressed as the system is tuned away from the concomitant transitions. The realisation of a tunable 2D polar metal state in FePSe$_3$ due to the loss of its inversion symmetry combined with pressure-induced metallicity offers a promising new platform to investigate this exotic phase at accessible pressures. |
| title | Emergent Polar Metal Phase in a Van der Waals Mott Magnet |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.13635 |