期刊
PHYSICAL REVIEW B
卷 96, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.115105
关键词
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资金
- National Basic Research Program of China [2014CB921001]
- National Natural Science Foundation of China [11274237, U1632122, 11004145, 51202153, U1332209, U1435208, 11134012, 11174355, 11474349, 11227405]
- University of Jiangsu Province [CXZZ13_0798]
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- US National Science Foundation [DMR-1643911, DMR-1565822]
- NSERC
- FRQNT
- CFI
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1643911, 1565822] Funding Source: National Science Foundation
Controlling functionalities, such as magnetism or ferroelectricity, by means of oxygen vacancies (V-O) is a key issue for the future development of transition-metal oxides. Progress in this field is currently addressed through V-O variations and their impact on mainly one order parameter. Here we reveal a mechanism for tuning bothmagnetism and ferroelectricity simultaneously by using V-O. Combining experimental and density-functional theory studies of Eu0.5Ba0.5TiO3-delta , we demonstrate that oxygen vacancies create Ti3+ 3d(1) defect states, mediating the ferromagnetic coupling between the localized Eu 4f(7) spins, and increase an off-center displacement of Ti ions, enhancing the ferroelectric Curie temperature. The dual function of Ti sites also promises a magnetoelectric coupling in the Eu0.5Ba0.5TiO3-delta.
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