Surface antiferromagnetism and incipient metal-insulator transition in strained manganite films
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Surface antiferromagnetism and incipient metal-insulator transition in strained manganite films.pdf
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ArticleKAUST Department
Computational Physics and Materials Science (CPMS)Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2013-06-21Preprint Posting Date
2012-12-20Permanent link to this record
http://hdl.handle.net/10754/315800
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Using first-principles calculations, we show that the (001) surface of the ferromagnet La0.7Sr0.3MnO3 under an epitaxial compressive strain favors antiferromagnetic (AF) order in the surface layers, coexisting with ferromagnetic (FM) bulk order. Surface antiferromagnetism is accompanied by a very marked surface-related spectral pseudogap, signaling an incomplete metal-insulator transition at the surface. The different relaxation and rumpling of the MnO2 and LaO surface planes in the two competing magnetic phases cause distinct work-function changes, which are of potential diagnostic use. The AF phase is recognized as an extreme surface-assisted case of the combination of in-plane AF super-exchange and vertical FM double-exchange couplings that rules magnetism in manganites under in-plane compression.Citation
Cossu F, Schwingenschlögl U, Colizzi G, Filippetti A, Fiorentini V (2013) Surface antiferromagnetism and incipient metal-insulator transition in strained manganite films. Phys Rev B 87. doi:10.1103/PhysRevB.87.214420.Publisher
American Physical Society (APS)Journal
Physical Review BarXiv
1212.5038ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevB.87.214420