Journal
PHYSICAL REVIEW B
Volume 85, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.104108
Keywords
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Funding
- National 973 Projects of China [2011CB922101, 2009CB623303]
- Natural Science Foundation of China [11074113, 50832002]
- Natural Science Foundation of Jiangsu Province, China [BK2008024]
- Jiangsu Higher Education Institutions, China
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The effect of Sr/Ti nonstoichiometry on the ferroelectricity and magnetism in polycrystalline SrTiO3 is investigated by the dielectric, ferroelectric, Raman, and magnetic characterizations. It revealed that the nonstoichiometric SrTiO3 exhibits both ferroelectric polarization and superparamagnetism, which increase with the degree of nonstoichiometry. It is argued that the antisite-like defects with net local dipoles and magnetic moments contribute to the ferroelectricity and superparamagnetism, confirmed by the first-principles calculations.
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