Piezomagnetism-driven magnetoelectric coupling in altermagnetic multiferroic K3Cr2F7
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908494789083136 |
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| author | Zhou, Ying Zhang, Hui-Min Ji, Cheng-Ao Xiang, Hongjun Dong, Shuai Rondinelli, James M. Lu, Xue-Zeng |
| author_facet | Zhou, Ying Zhang, Hui-Min Ji, Cheng-Ao Xiang, Hongjun Dong, Shuai Rondinelli, James M. Lu, Xue-Zeng |
| contents | Ferroelectric control of altermagnetism in momentum space has been studied widely, while the control of magnetism in real space of altermagnets are still rare. We present a design rule to identify multiferroicity in n=2 Ruddlesden-Popper halides. Our results show that a Jahn-Teller distortion can cooperate with oxygen octahedral rotations to break inversion symmetry, which we demonstrate in K3Cr2F7 and cation-ordered KAg2Cu2Cl7, and leads to a ferrielectric-to-ferroelectric phase transition in K3Cr2F7. Altermagnetic spin order in the ferrielectric phase of K3Cr2F7 transforms into a conventional antiferromagnetic order in the ferroelectric phase, at which strain/pressure engineered sizable changes of weak ferromagnetism can occur. Our study is not only conducive to realize strong magnetoelectric coupling in multiferroics, but also reveals more functionalities in altermagnetic materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_13952 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Piezomagnetism-driven magnetoelectric coupling in altermagnetic multiferroic K3Cr2F7 Zhou, Ying Zhang, Hui-Min Ji, Cheng-Ao Xiang, Hongjun Dong, Shuai Rondinelli, James M. Lu, Xue-Zeng Materials Science Ferroelectric control of altermagnetism in momentum space has been studied widely, while the control of magnetism in real space of altermagnets are still rare. We present a design rule to identify multiferroicity in n=2 Ruddlesden-Popper halides. Our results show that a Jahn-Teller distortion can cooperate with oxygen octahedral rotations to break inversion symmetry, which we demonstrate in K3Cr2F7 and cation-ordered KAg2Cu2Cl7, and leads to a ferrielectric-to-ferroelectric phase transition in K3Cr2F7. Altermagnetic spin order in the ferrielectric phase of K3Cr2F7 transforms into a conventional antiferromagnetic order in the ferroelectric phase, at which strain/pressure engineered sizable changes of weak ferromagnetism can occur. Our study is not only conducive to realize strong magnetoelectric coupling in multiferroics, but also reveals more functionalities in altermagnetic materials. |
| title | Piezomagnetism-driven magnetoelectric coupling in altermagnetic multiferroic K3Cr2F7 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2508.13952 |