Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 10, Pages 4738-4745Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp02424d
Keywords
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Funding
- Creative research group of National Natural Science Foundation of China [50721003]
- National Natural Science Foundation of China [50802026, 90923014, 10974050]
- Doctoral Program for New Teacher of Higher Education [20070532010]
- China Postdoctoral Science Foundation [20090450187]
- Hunan Provincial Natural Science Foundation of China [09jj4001]
- Graduated Student Innovation Item of Hunan Province [CX2010B131]
- State Key Laboratory of Optoelectronic Materials and Technologies of Sun Yat-sen University [KF2009-ZD-08]
- Postdoctoral Science Foundation of Central South University
- Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Program for New Century Excellent Talents in University [NCET-08-0182]
- Hunan Provincial Natural Science Fund [09JJ1009]
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The origin of magnetism induced by vacancies on BaTiO3(001) surfaces is investigated systematically by first-principles calculations within density-functional theory. The calculated results show that O vacancy is responsible for the magnetism of the BaO-terminated surface and the magnetism of the TiO2-terminated surface is induced by Ti vacancy. For the BaO-terminated surface, the magnetism mainly arises from the unpaired electrons that are localized in the O vacancy basin. In contrast, for the TiO2-terminated surface, the magnetism mainly originates from the partially occupied O-2p states of the first nearest neighbor O atoms surrounding the Ti vacancy. These results suggest the possibility of implementing magneto-electric coupling in conventional ferroelectric materials.
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