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Electrostatic potential and valence modulation in La0.7Sr0.3MnO3 thin films
- Source :
- Scientific Reports, Vol 8, Iss 1, Pp 1-7 (2018)
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- 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.
- Subjects :
- Materials science
Absorption spectroscopy
Expected Bulk Value
Science
Oxide
02 engineering and technology
Expected value
01 natural sciences
Polar Catastrophe
chemistry.chemical_compound
Surface Valence
LSMO Layers
0103 physical sciences
Redistribution (chemistry)
Thin film
010306 general physics
Multidisciplinary
Valence (chemistry)
Condensed matter physics
021001 nanoscience & nanotechnology
chemistry
Medicine
Polar
Thin Film LSMO
0210 nano-technology
Fermi gas
Subjects
Details
- ISSN :
- 20452322
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Scientific Reports
- Accession number :
- edsair.doi.dedup.....63bb382135b401baeeca4460837baa0f