科研之友
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摘要
Using atomically resolved imaging and spectroscopy, we reveal a remarkably deep polarization in nonferroelectric SrTiO3 near its interface with an ultrathin nonmetallic film of La2/3Sr1/3MnO3. Electron holography shows an electric field near the interface in SrTiO3, yielding a surprising spontaneous polarization density of similar to 21 mu C/cm(2). Combining the experimental results with first-principles calculations, we propose that the observed deep polarization is induced by the electric field originating from oxygen vacancies that extend beyond a dozen unit cells from the interface, thus providing important evidence of the role of defects in the emergent interface properties of transition metal oxides.
- 出版日期2016-10-17
