Enhanced magnetism in lightly doped manganite heterostructures: strain or stoichiometry?
| Autor: | Hyungkyu Han, Qiang Wang, Dezhen Xue, Turab Lookman, Richard Mbatang, Erik Enriquez, Ruihao Yuan, Stephen J. Pennycook, Edwin Fohtung, Aiping Chen, Paul Dowden, Deqing Xue |
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| Rok vydání: | 2019 |
| Předmět: |
Phase boundary
Materials science Condensed matter physics Strain (chemistry) Doping Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Manganite Microstructure 01 natural sciences 0104 chemical sciences General Materials Science Thin film 0210 nano-technology Perovskite (structure) |
| Zdroj: | Nanoscale. 11:7364-7370 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | 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 La0.9Sr0.1MnO3 (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 TC which is 97 K higher than the bulk value. Such anomalies in TC 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. |
| Databáze: | OpenAIRE |
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