Flat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanism
Abstract Electron systems with strong geometrical frustrations have flat bands, and their unusual band dispersions are expected to induce a wide variety of physical properties. However, for the emergence of such properties, the Fermi level must be pinned within the flat band. In this study, we perfo...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-03-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-31917-w |
| _version_ | 1797859988378484736 |
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| author | I. Hase Y. Higashi H. Eisaki K. Kawashima |
| author_facet | I. Hase Y. Higashi H. Eisaki K. Kawashima |
| author_sort | I. Hase |
| collection | DOAJ |
| description | Abstract Electron systems with strong geometrical frustrations have flat bands, and their unusual band dispersions are expected to induce a wide variety of physical properties. However, for the emergence of such properties, the Fermi level must be pinned within the flat band. In this study, we performed first-principles calculations on pyrochlore oxide Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 and theoretically clarified that the self-doping mechanism induces pinning of the Fermi level in the flat band in this system. Therefore, a very high density of states is realized at the Fermi level, and the ferromagnetic state transforms into the ground state via a flat band mechanism, although the system does not contain any magnetic elements. This compound has the potential to serve as a new platform for projecting the properties of flat band systems in the real world. |
| first_indexed | 2024-04-09T21:38:29Z |
| format | Article |
| id | doaj.art-e6587f65f70c4cf282cb8b5b2af03a13 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-09T21:38:29Z |
| publishDate | 2023-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-e6587f65f70c4cf282cb8b5b2af03a132023-03-26T11:11:13ZengNature PortfolioScientific Reports2045-23222023-03-011311810.1038/s41598-023-31917-wFlat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanismI. Hase0Y. Higashi1H. Eisaki2K. Kawashima3National Institute of Advanced Industrial Science and Technology (AIST)National Institute of Advanced Industrial Science and Technology (AIST)National Institute of Advanced Industrial Science and Technology (AIST)IMRA-JAPAN Material R &D Co. Ltd.Abstract Electron systems with strong geometrical frustrations have flat bands, and their unusual band dispersions are expected to induce a wide variety of physical properties. However, for the emergence of such properties, the Fermi level must be pinned within the flat band. In this study, we performed first-principles calculations on pyrochlore oxide Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 and theoretically clarified that the self-doping mechanism induces pinning of the Fermi level in the flat band in this system. Therefore, a very high density of states is realized at the Fermi level, and the ferromagnetic state transforms into the ground state via a flat band mechanism, although the system does not contain any magnetic elements. This compound has the potential to serve as a new platform for projecting the properties of flat band systems in the real world.https://doi.org/10.1038/s41598-023-31917-w |
| spellingShingle | I. Hase Y. Higashi H. Eisaki K. Kawashima Flat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanism Scientific Reports |
| title | Flat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanism |
| title_full | Flat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanism |
| title_fullStr | Flat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanism |
| title_full_unstemmed | Flat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanism |
| title_short | Flat band ferromagnetism in Pb $$_2$$ 2 Sb $$_2$$ 2 O $$_7$$ 7 via a self-doped mechanism |
| title_sort | flat band ferromagnetism in pb 2 2 sb 2 2 o 7 7 via a self doped mechanism |
| url | https://doi.org/10.1038/s41598-023-31917-w |
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