Defect Engineered Room-Temperature Ferromagnetism in Quasi-Two-Dimensional Nitrided CoTa2O6
| Autor: | Ma, Yalin, Zhao, Shuang, Zhou, Xiao, Zeng, Yijie, Song, Haili, Wang, Jing, Li, Guangqin, Frank, Corey E., Ma, Lu, Croft, Mark, Wang, Yonggang, Greenblatt, Martha, Yao, Dao-Xin, Li, Man-Rong |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 104, 014421 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.104.014421 |
| Popis: | Thermal ammonolysis of quasi-two-dimensional (quasi-2D) CoTa2O6 yields the O2-/N3- and anionic vacancy ordered Co2+Ta5+2O6-xN2x/3$\Box$x/3 (x $\leq$ 0.15) that exhibits a transition from antiferromagnetism to defect engineered above room-temperature ferromagnetism as evidenced by diffraction, spectroscopic and magnetic characterizations. First-principles calculations reveal the origin of ferromagnetism is a particular CoON configuration with N located at Wyckoff position 8j, which breaks mirror symmetry about ab plane. A pressure-induced electronic phase transition is also predicted at around 24.5 GPa, accompanied by insulator-to-metal transition and magnetic moment vanishing. Comment: 9 pages, 7 figures; Supporting Information 27 pages, 17 figures |
| Databáze: | arXiv |
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