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The present LDA+U calculations show that neutral strontium vacancies at the SrO (100) surface could bring about large magnetic moments, locating mainly on the oxygen atoms surrounding the vacancies at the uppermost surface. 6.25% neutral strontium vacancies lead to a ferromagnetic state of the surface. Carbon or nitrogen substitution for oxygen at the SrO (100) surface leads to holes in C/N 2p states,...
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