Electrostatic potential and valence modulation in La0.7Sr0.3MnO3 thin films
- West Virginia Univ., Morgantown, WV (United States). Dept. of Physics and Astronomy
- West Virginia Univ., Morgantown, WV (United States). Dept. of Physics and Astronomy; Univ. of Liège (Belgium). Theoretical Physics of Materials; Industrial Univ. of Santander, Bucaramanga (Colombia). Dept. of Physics
- National Chiao Tung Univ., Hsinchu (Taiwan). Inst. of Physics
- West Virginia Univ., Morgantown, WV (United States). Dept. of Mechanical & Aerospace Engineering
- West Virginia Univ., Morgantown, WV (United States). Dept. of Physics and Astronomy; Meritorious Autonomous Univ. of Puebla (BUAP) (Mexico). Faculty of Engineering
- North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering
The Mn valence in thin film La0.7Sr0.3MnO3 was studied as a function of film thickness in the range of 1–16 unit cells with a combination of non-destructive bulk and surface sensitive X-ray absorption spectroscopy techniques. Using a layer-by-layer valence model, it was found that while the bulk averaged valence hovers around its expected value of 3.3, a significant deviation occurs within several unit cells of the surface and interface. These results were supported by first principles calculations. The surface valence increases to up to Mn3.7+, whereas the interface valence reduces down to Mn2.5+. The change in valence from the expected bulk value is consistent with charge redistribution due to the polar discontinuity at the film-substrate interface. The comparison with theory employed here illustrates how this layer-by-layer valence evolves with film thickness and allows for a deeper understanding of the microscopic mechanisms at play in this effect. These results offer insight on how the two-dimensional electron gas is created in thin film oxide alloys and how the magnetic ordering is reduced with dimensionality.
- Research Organization:
- West Virginia Univ., Morgantown, WV (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0016176; AC02-05CH11231; DMR-1608656; ACI-1053575; DMREF-NSF 1434897
- OSTI ID:
- 1499989
- Journal Information:
- Scientific Reports, Vol. 8; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films
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journal | September 2019 |
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