Interfaces between certain insulating perovskite oxides show unexpected properties, such as high conductivity and magnetism. Oxygen vacancies seem to be important in these structures, but the puzzle is far from being understood.
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Eckstein, J. Watch out for the lack of oxygen. Nature Mater 6, 473–474 (2007). https://doi.org/10.1038/nmat1944
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DOI: https://doi.org/10.1038/nmat1944
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