Enhanced magnetism in lightly doped manganite heterostructures: Strain or stoichiometry?

Richard Mbatang, Deqing Xue, Erik Enriquez, Ruihao Yuan, Hyungkyu Han, Paul Dowden, Qiang Wang, Edwin Fohtung, Dezhen Xue, Turab Lookman, Stephen J. Pennycook, Aiping Chen

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13 引用 (Scopus)

摘要

Lattice mismatch induced epitaxial strain has been widely used to tune functional properties in complex oxide heterostructures. Apart from the epitaxial strain, a large lattice mismatch also produces other effects including modulations in microstructure and stoichiometry. However, it is challenging to distinguish the impact of these effects from the strain contribution to thin film properties. Here, we use La 0.9 Sr 0.1 MnO 3 (LSMO), a lightly doped manganite close to the vertical phase boundary, as a model system to demonstrate that both epitaxial strain and cation stoichiometry induced by strain relaxation contribute to functionality tuning. The thinner LSMO films are metallic with a greatly enhanced T C which is 97 K higher than the bulk value. Such anomalies in T C and transport cannot be fully explained by the epitaxial strain alone. Detailed microstructure analysis indicates La deficiency in thinner films and twin domain formation in thicker films. Our results have revealed that both epitaxial strain and strain relaxation induced stoichiometry/microstructure modulations contribute to the modified functional properties in lightly doped manganite perovskite thin films.

源语言英语
页(从-至)7364-7370
页数7
期刊Nanoscale
11
15
DOI
出版状态已出版 - 21 4月 2019
已对外发布

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