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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/2503.21637 |
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| _version_ | 1866916669528473600 |
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| author | Malyshev, Roman Brekke, Bjørnulf Svenum, Ingeborg-Helene Selbach, Sverre M. Brüne, Christoph Brataas, Arne Tybell, Thomas |
| author_facet | Malyshev, Roman Brekke, Bjørnulf Svenum, Ingeborg-Helene Selbach, Sverre M. Brüne, Christoph Brataas, Arne Tybell, Thomas |
| contents | CuFeS$_2$ is an altermagnetic semiconductor that is lattice-matched with silicon and has a high Néel temperature. It is nonpolar and magnetically compensated in its structural ground state. However, the crystal belongs to a magnetic symmetry class allowing simultaneous piezoelectricity and -magnetism, indicating that distortion by shear strain may enable functional properties not observed in its tetragonal ground state. This first-principles study explores how biaxial and shear strain affect the crystal structure and functional properties. Biaxial strain lowers crystal symmetry when applied to two of the three crystallographic {001} planes considered, enhancing the altermagnetic lifting of the Kramers degeneracy. Shear strain has a compressive effect on the crystal, enhancing the effects on the electronic structure seen under biaxial compressive strain. Applying it to any one of the three {001} planes induces a polar phase with an out-of-plane electric polarization, perpendicular to the strained plane. Moreover, applying shear strain to two out of the three {001} planes induces a net magnetization simultaneously with electric polarization, producing a multiferroic response. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_21637 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Shear Strain-Induced Multiferroic Response in the Altermagnetic Semiconductor CuFeS$_2$ Malyshev, Roman Brekke, Bjørnulf Svenum, Ingeborg-Helene Selbach, Sverre M. Brüne, Christoph Brataas, Arne Tybell, Thomas Materials Science CuFeS$_2$ is an altermagnetic semiconductor that is lattice-matched with silicon and has a high Néel temperature. It is nonpolar and magnetically compensated in its structural ground state. However, the crystal belongs to a magnetic symmetry class allowing simultaneous piezoelectricity and -magnetism, indicating that distortion by shear strain may enable functional properties not observed in its tetragonal ground state. This first-principles study explores how biaxial and shear strain affect the crystal structure and functional properties. Biaxial strain lowers crystal symmetry when applied to two of the three crystallographic {001} planes considered, enhancing the altermagnetic lifting of the Kramers degeneracy. Shear strain has a compressive effect on the crystal, enhancing the effects on the electronic structure seen under biaxial compressive strain. Applying it to any one of the three {001} planes induces a polar phase with an out-of-plane electric polarization, perpendicular to the strained plane. Moreover, applying shear strain to two out of the three {001} planes induces a net magnetization simultaneously with electric polarization, producing a multiferroic response. |
| title | Shear Strain-Induced Multiferroic Response in the Altermagnetic Semiconductor CuFeS$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2503.21637 |