Structural phases driven by oxygen vacancies at the La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} hetero-interface

Journal Article · Mon Jan 26 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4906920· OSTI ID:22415180

Nord, M.; Holmestad, R. ^[1]; Vullum, P. E. ^[1]; Moreau, M.; Boschker, J. E.; Selbach, S. M. ^[2]

---

1. Department of Physics, NTNU, 7491 Trondheim (Norway)
2. Department of Materials Science and Engineering, NTNU, 7491 Trondheim (Norway)

An oxygen vacancy driven structural response at the epitaxial interface between La{sub 0.7}Sr{sub 0.3}MnO{sub 3} films and SrTiO{sub 3} 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 La{sub 0.7}Sr{sub 0.3}MnO{sub 3} 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.

• OSTI ID: 22415180
• Journal Information: Applied Physics Letters, Vol. 106, Issue 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DENSITY FUNCTIONAL METHOD
ELECTRONS
ENERGY-LOSS SPECTROSCOPY
EPITAXY
FILMS
INTERFACES
LANTHANUM
LATTICE PARAMETERS
MANGANESE
MANGANESE OXIDES
OXYGEN
STRONTIUM
STRONTIUM TITANATES
SUBSTRATES
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES