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

被引：40
|
作者：
Nord, M. [1 ,2 ]
Vullum, P. E. [1 ]
Moreau, M. [3 ]
Boschker, J. E. [3 ]
Selbach, S. M. [4 ]
Holmestad, R. [1 ]
Tybell, T. [3 ]
机构：
[1] NTNU, Dept Phys, N-7491 Trondheim, Norway
[2] SINTEF, N-7465 Trondheim, Norway
[3] NTNU, Dept Elect & Telecommun, N-7491 Trondheim, Norway
[4] NTNU, Dept Mat Sci & Engn, N-7491 Trondheim, Norway
来源：
APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 04期
关键词：
PULSED-LASER DEPOSITION; AUGMENTED-WAVE METHOD; THIN-FILMS; ENERGY; LAYERS; EELS;
D O I：
10.1063/1.4906920
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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. (C) 2015 AIP Publishing LLC.
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页数：4
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