Large anisotropic magnetoresistance in $α$-MnTe induced by strain
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912750559559680 |
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| author | Chen, Bao-Feng Yu, Jie-Xiang Yin, Gen |
| author_facet | Chen, Bao-Feng Yu, Jie-Xiang Yin, Gen |
| contents | $α\textrm{-MnTe}$ is a p-type semiconducting altermagnet with a Néel temperature near $300\thinspace\textrm{K}$. Due to the altermagnetic nature, $\mathcal{PT}$ symmetry is broken, and Kramers degeneracy is lifted in the valence band maxima along the $Γ\textrm{-K}$ line and the A point. However, the energy difference is found to be small, and any small shift in the spectrum can dramatically change the linear-response transport properties. Here we show that a strain modulating the [0001] axis of the unit cell by $\sim\pm0.5\%$ can significantly change the transport signature by switching the thermal window between the two regions of the valence band. When the $Γ\textrm{-K}$ line is dominating, the planar Hall effect and the anisotropic magnetoresistance can be enhanced by an order of magnitude, with the maximum up to $\sim70\%$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_16738 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Large anisotropic magnetoresistance in $α$-MnTe induced by strain Chen, Bao-Feng Yu, Jie-Xiang Yin, Gen Materials Science $α\textrm{-MnTe}$ is a p-type semiconducting altermagnet with a Néel temperature near $300\thinspace\textrm{K}$. Due to the altermagnetic nature, $\mathcal{PT}$ symmetry is broken, and Kramers degeneracy is lifted in the valence band maxima along the $Γ\textrm{-K}$ line and the A point. However, the energy difference is found to be small, and any small shift in the spectrum can dramatically change the linear-response transport properties. Here we show that a strain modulating the [0001] axis of the unit cell by $\sim\pm0.5\%$ can significantly change the transport signature by switching the thermal window between the two regions of the valence band. When the $Γ\textrm{-K}$ line is dominating, the planar Hall effect and the anisotropic magnetoresistance can be enhanced by an order of magnitude, with the maximum up to $\sim70\%$. |
| title | Large anisotropic magnetoresistance in $α$-MnTe induced by strain |
| topic | Materials Science |
| url | https://arxiv.org/abs/2507.16738 |