Electrostatic potential and valence modulation in La0.7Sr0.3MnO3 thin films

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Abstract :

[en] 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. © 2018, The Author(s).

Disciplines :

Physics

Author, co-author :

Trappen, R.; Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, United States

Garcia Castro, Andrés Camilo ; Université de Liège - ULiège

Tra, V. T.; Institute of Physics, National Chiao Tung University, HsinChu, 30010, Taiwan

Huang, C.-Y.; Department of Mechanical & Aerospace Engineering, West Virginia University, Morgantown, WV 26506, United States

Ibarra-Hernandez, W.; Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, United States, Facultad de Ingeniería-BUAP, Apartado Postal J-39, Puebla, Pue. 72570, Mexico

Fitch, J.; Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, United States

Singh, Sobhit

Zhou, J.; Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, United States

Cabrera, G.; Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, United States

Chu, Y.-H.; Institute of Physics, National Chiao Tung University, HsinChu, 30010, Taiwan

More authors (3 more)

Language :

English

Title :

Electrostatic potential and valence modulation in La0.7Sr0.3MnO3 thin films

Publication date :

2018

Journal title :

Scientific Reports

eISSN :

2045-2322

Publisher :

Nature Publishing Group, London, United Kingdom

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

NSF - National Science Foundation
DOE - United States. Department of Energy

Funding text :

1434897; DE-SC0016176; HEPC.dsr.12.29; National Science Foundation, NSF: ACI-1053575, DMR-1608656; U.S. Department of Energy, DOE: DE- SC0016176; Office of Science, SC

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