Structural phases driven by oxygen vacancies at the La0.7Sr0.3MnO3/SrTiO3 hetero-interface | Zendy

Magnus Nord | Zendy; Per Erik Vullum | Zendy; Magnus Moreau | Zendy; Jos E. Boschker | Zendy; Sverre M. Selbach | Zendy; Randi Holmestad | Zendy; Thomas Tybell | Zendy

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Structural phases driven by oxygen vacancies at the La0.7Sr0.3MnO3/SrTiO3 hetero-interface

Author(s) -

Magnus Nord,

Per Erik Vullum,

Magnus Moreau,

Jos E. Boschker,

Sverre M. Selbach,

Randi Holmestad,

Thomas Tybell

Publication year - 2015

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4906920

Subject(s) - brownmillerite , oxygen , materials science , transmission electron microscopy , electron energy loss spectroscopy , condensed matter physics , density functional theory , scanning transmission electron microscopy , epitaxy , vacancy defect , manganese , crystallography , crystallographic defect , chemical physics , chemistry , nanotechnology , computational chemistry , metallurgy , physics , organic chemistry , layer (electronics)

An oxygen vacancy driven structural response at the epitaxial interface between La0.7Sr0.3MnO3 films and SrTiO3 substrates is reported. A combined scanning transmission electron microscopy and electron energy loss spectroscopy study reveal the presence of an elongated out-of-plane lattice parameter, coupled to oxygen vacancies and reduced manganese oxidation state at the La0.7Sr0.3MnO3 side of the interface. Density functional theory calculations support that the measured interface structure is a disordered oxygen deficient brownmillerite structure. The effect of oxygen vacancy mobility is assessed, revealing an ordering of the vacancies with time.

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