Pressure induced metallization and loss of surface magnetism in FeSi
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| Format: | Preprint |
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2024
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| _version_ | 1866914788276174848 |
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| author | Deng, Yuhang Taraporevala, Farhad Wang, Haozhe Lee-Wong, Eric Moir, Camilla M. Lim, Jinhyuk Sinha, Shubham Xie, Weiwei Hamlin, James Vohra, Yogesh Maple, M. Brian |
| author_facet | Deng, Yuhang Taraporevala, Farhad Wang, Haozhe Lee-Wong, Eric Moir, Camilla M. Lim, Jinhyuk Sinha, Shubham Xie, Weiwei Hamlin, James Vohra, Yogesh Maple, M. Brian |
| contents | Single crystalline FeSi samples with a conducting surface state (CSS) were studied under high pressure ($\textit{P}$) and magnetic field ($\textit{B}$) by means of electrical resistance ($\textit{R}$) measurements to explore how the bulk semiconducting state and the surface state are tuned by the application of pressure. We found that the energy gap ($Δ$) associated with the semiconducting bulk phase begins to close abruptly at a critical pressure ($P_{cr}$) of ~10 GPa and the bulk material becomes metallic with no obvious sign of any emergent phases or non-Fermi liquid behavior in $\textit{R}$($\textit{T}$) in the neighborhood of $P_{cr}$ above 3 K. Moreover, the metallic phase appears to remain at near-ambient pressure upon release of the pressure. Interestingly, the hysteresis in the $\textit{R}$($\textit{T}$) curve associated with the magnetically ordered CSS decreases with pressure and vanishes at $P_{cr}$, while the slope of the $\textit{R}$($\textit{B}$) curve, d$\textit{R}$/d$\textit{B}$, which has a negative value for $\textit{P}$ < $P_{cr}$, decreases in magnitude with $\textit{P}$ and changes sign at $P_{cr}$. Thus, the CSS and the corresponding two-dimensional magnetic order collapse at $P_{cr}$ where the energy gap $Δ$ of the bulk material starts to close abruptly, revealing the connection between the CSS and the semiconducting bulk state in FeSi. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_04739 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pressure induced metallization and loss of surface magnetism in FeSi Deng, Yuhang Taraporevala, Farhad Wang, Haozhe Lee-Wong, Eric Moir, Camilla M. Lim, Jinhyuk Sinha, Shubham Xie, Weiwei Hamlin, James Vohra, Yogesh Maple, M. Brian Strongly Correlated Electrons Materials Science Single crystalline FeSi samples with a conducting surface state (CSS) were studied under high pressure ($\textit{P}$) and magnetic field ($\textit{B}$) by means of electrical resistance ($\textit{R}$) measurements to explore how the bulk semiconducting state and the surface state are tuned by the application of pressure. We found that the energy gap ($Δ$) associated with the semiconducting bulk phase begins to close abruptly at a critical pressure ($P_{cr}$) of ~10 GPa and the bulk material becomes metallic with no obvious sign of any emergent phases or non-Fermi liquid behavior in $\textit{R}$($\textit{T}$) in the neighborhood of $P_{cr}$ above 3 K. Moreover, the metallic phase appears to remain at near-ambient pressure upon release of the pressure. Interestingly, the hysteresis in the $\textit{R}$($\textit{T}$) curve associated with the magnetically ordered CSS decreases with pressure and vanishes at $P_{cr}$, while the slope of the $\textit{R}$($\textit{B}$) curve, d$\textit{R}$/d$\textit{B}$, which has a negative value for $\textit{P}$ < $P_{cr}$, decreases in magnitude with $\textit{P}$ and changes sign at $P_{cr}$. Thus, the CSS and the corresponding two-dimensional magnetic order collapse at $P_{cr}$ where the energy gap $Δ$ of the bulk material starts to close abruptly, revealing the connection between the CSS and the semiconducting bulk state in FeSi. |
| title | Pressure induced metallization and loss of surface magnetism in FeSi |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2405.04739 |