Abstract：
:The interplay between orbital, charge, spin, and lattice degrees of freedom is at the core of correlated oxides. This is extensively studied at the interface of heterostructures constituted of two-layer or multilayer oxide films. Here, we demonstrate the interactions between orbital reconstruction and charge transfer in the surface regime of ultrathin (La,Sr)MnO3, which is a model system of correlated oxides. The interactions are manipulated in a quantitative manner by surface symmetry-breaking and epitaxial strain, both tensile and compressive. The established charge transfer, accompanied by the formation of oxygen vacancies, provides a conceptually novel vision for the long-term problem of manganites--the severe surface/interface magnetization and conductivity deterioration. The oxygen vacancies are then purposefully tuned by cooling oxygen pressure, markedly improving the performances of differently strained films. Our findings offer a broad opportunity to tailor and benefit from the entanglements between orbit, charge, spin, and lattice at the surface of oxide films.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Cui B,Song C,Li F,Wang GY,Mao HJ,Peng JJ,Zeng F,Pan Fdoi
10.1038/srep04206subject
Has Abstractpub_date
2014-02-26 00:00:00pages
4206issn
2045-2322pii
srep04206journal_volume
4pub_type
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