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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2022
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2203.03199 |
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| _version_ | 1866916098518024192 |
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| author | Peng, Wei Park, Se Young Roh, Chang Jae Mun, Junsik Ju, Hwiin Kim, Jinkwon Ko, Eun Kyo Liang, Zhengguo Hahn, Sungsoo Zhang, Jinfeng Si, Liang Jo, Yong Jin Kim, Tae Heon Kim, Changyoung Wang, Lingfei Kim, Miyoung Lee, Jong Seok Noh, Tae Won Lee, Daesu |
| author_facet | Peng, Wei Park, Se Young Roh, Chang Jae Mun, Junsik Ju, Hwiin Kim, Jinkwon Ko, Eun Kyo Liang, Zhengguo Hahn, Sungsoo Zhang, Jinfeng Si, Liang Jo, Yong Jin Kim, Tae Heon Kim, Changyoung Wang, Lingfei Kim, Miyoung Lee, Jong Seok Noh, Tae Won Lee, Daesu |
| contents | Electric fields have played a key role in discovering and controlling exotic electronic states of condensed matter. However, electric fields usually do not work in metals as free carriers tend to screen electrostatic fields. While a pseudo-electric field generated by inhomogeneous lattice strain, namely a flexoelectric field, can in principle work in all classes of materials, it remains experimentally unexplored in metals. Here, using heteroepitaxy and atomic-scale imaging, we show that flexoelectric fields can polarize a metallic oxide SrRuO3 with unexpectedly large Ru off-center displacements. We also observe that the flexoelectrically induced polar state of SrRuO3 leads to sizable lattice expansion, similar to the electrostrictive expansion caused by ionic displacements in dielectrics under an external electric field. We further suggest that flexoelectrically driven Ru off-centering promotes strong coupling between lattice and electronic degrees of freedom, possibly enhancing the ferromagnetism of SrRuO3. Beyond conventional electric fields, flexoelectric fields may universally engender novel electronic states and their control via pure atomic displacements in a nondestructive and fast manner. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2203_03199 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Flexoelectric control of a ferromagnetic metal Peng, Wei Park, Se Young Roh, Chang Jae Mun, Junsik Ju, Hwiin Kim, Jinkwon Ko, Eun Kyo Liang, Zhengguo Hahn, Sungsoo Zhang, Jinfeng Si, Liang Jo, Yong Jin Kim, Tae Heon Kim, Changyoung Wang, Lingfei Kim, Miyoung Lee, Jong Seok Noh, Tae Won Lee, Daesu Materials Science Strongly Correlated Electrons Electric fields have played a key role in discovering and controlling exotic electronic states of condensed matter. However, electric fields usually do not work in metals as free carriers tend to screen electrostatic fields. While a pseudo-electric field generated by inhomogeneous lattice strain, namely a flexoelectric field, can in principle work in all classes of materials, it remains experimentally unexplored in metals. Here, using heteroepitaxy and atomic-scale imaging, we show that flexoelectric fields can polarize a metallic oxide SrRuO3 with unexpectedly large Ru off-center displacements. We also observe that the flexoelectrically induced polar state of SrRuO3 leads to sizable lattice expansion, similar to the electrostrictive expansion caused by ionic displacements in dielectrics under an external electric field. We further suggest that flexoelectrically driven Ru off-centering promotes strong coupling between lattice and electronic degrees of freedom, possibly enhancing the ferromagnetism of SrRuO3. Beyond conventional electric fields, flexoelectric fields may universally engender novel electronic states and their control via pure atomic displacements in a nondestructive and fast manner. |
| title | Flexoelectric control of a ferromagnetic metal |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2203.03199 |