p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen
Abstract Oxygen in solids usually exists in an O2− ionic state. As a result, it loses its magnetic nature of a single atom, wherein two unpaired electrons exist in its outer 2p orbitals. Here, it is shown that an unconventional stable ionic state of O− is realized in a new semiconductor material Sr2...
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Wiley
2025-01-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202410977 |
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| author | Xu‐Guang Zheng Chao‐Nan Xu Tomoki Uchiyama Ichihiro Yamauchi Tomasz Galica Eiji Nishibori Ying Chen |
| author_facet | Xu‐Guang Zheng Chao‐Nan Xu Tomoki Uchiyama Ichihiro Yamauchi Tomasz Galica Eiji Nishibori Ying Chen |
| author_sort | Xu‐Guang Zheng |
| collection | DOAJ |
| description | Abstract Oxygen in solids usually exists in an O2− ionic state. As a result, it loses its magnetic nature of a single atom, wherein two unpaired electrons exist in its outer 2p orbitals. Here, it is shown that an unconventional stable ionic state of O− is realized in a new semiconductor material Sr2AlO4, leading to an intrinsic p‐orbital ferromagnetism stable until ≈900 K. Experimental and theoretical investigations have clarified that one‐fourth of the oxygen atoms in Sr2AlO4 are insufficiently bonded in the crystal structure, resulting in a unique O−‐state and p‐orbital ferromagnetism. To date, the O− state is reported to exist only in non‐equilibrium conditions, and p‐orbital magnetism is only suggested in impurity bands with small ferromagnetic moments. The present work provides a new route for creating ferromagnetism in semiconductors and exploring new p‐orbital physics and chemistry. In addition, the material shows elastic‐mechanoluminescence that may enable unprecedented mechano‐photonic‐spintronics. |
| format | Article |
| id | doaj-art-10a37adde3c842cb8dd20dbf6541030a |
| institution | Kabale University |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
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| series | Advanced Science |
| spelling | doaj-art-10a37adde3c842cb8dd20dbf6541030a2025-01-09T11:44:45ZengWileyAdvanced Science2198-38442025-01-01121n/an/a10.1002/advs.202410977p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded OxygenXu‐Guang Zheng0Chao‐Nan Xu1Tomoki Uchiyama2Ichihiro Yamauchi3Tomasz Galica4Eiji Nishibori5Ying Chen6Department of Materials Science and Engineering Faculty of Engineering Tohoku University Sendai 980‐8579 JapanDepartment of Materials Science and Engineering Faculty of Engineering Tohoku University Sendai 980‐8579 JapanDepartment of Materials Science and Engineering Faculty of Engineering Tohoku University Sendai 980‐8579 JapanDepartment of Physics Faculty of Science and Engineering Saga University Saga 840‐8502 JapanDepartment of Physics Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science University of Tsukuba Ibaraki 305‐8571 JapanDepartment of Physics Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science University of Tsukuba Ibaraki 305‐8571 JapanFracture and Reliability Research Institute, Faculty of Engineering Tohoku University Sendai 980‐8579 JapanAbstract Oxygen in solids usually exists in an O2− ionic state. As a result, it loses its magnetic nature of a single atom, wherein two unpaired electrons exist in its outer 2p orbitals. Here, it is shown that an unconventional stable ionic state of O− is realized in a new semiconductor material Sr2AlO4, leading to an intrinsic p‐orbital ferromagnetism stable until ≈900 K. Experimental and theoretical investigations have clarified that one‐fourth of the oxygen atoms in Sr2AlO4 are insufficiently bonded in the crystal structure, resulting in a unique O−‐state and p‐orbital ferromagnetism. To date, the O− state is reported to exist only in non‐equilibrium conditions, and p‐orbital magnetism is only suggested in impurity bands with small ferromagnetic moments. The present work provides a new route for creating ferromagnetism in semiconductors and exploring new p‐orbital physics and chemistry. In addition, the material shows elastic‐mechanoluminescence that may enable unprecedented mechano‐photonic‐spintronics.https://doi.org/10.1002/advs.202410977magnetic semiconductorO− ionic statep‐orbital ferromagnetismSr2AlO4 |
| spellingShingle | Xu‐Guang Zheng Chao‐Nan Xu Tomoki Uchiyama Ichihiro Yamauchi Tomasz Galica Eiji Nishibori Ying Chen p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen Advanced Science magnetic semiconductor O− ionic state p‐orbital ferromagnetism Sr2AlO4 |
| title | p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen |
| title_full | p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen |
| title_fullStr | p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen |
| title_full_unstemmed | p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen |
| title_short | p‐Orbital Ferromagnetism Arising from Unconventional O− Ionic State in a New Semiconductor Sr2AlO4 with Insufficiently Bonded Oxygen |
| title_sort | p orbital ferromagnetism arising from unconventional o ionic state in a new semiconductor sr2alo4 with insufficiently bonded oxygen |
| topic | magnetic semiconductor O− ionic state p‐orbital ferromagnetism Sr2AlO4 |
| url | https://doi.org/10.1002/advs.202410977 |
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