On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3 MnO3 multilayer thin films
Abstract
The atomic and electronic structures of La0.7Sr0.3MnO3 (LSMO)/La0.7Sr0.3CrO3 (LSCO) multilayer thin films are investigated using aberration corrected scanning transmission electron microscopy (STEM) imaging and spectroscopy. Atomic resolution high angle annular dark-field reveals that LSMO layers have an expanded out-of-plane lattice parameter compared to compressed LSCO layers, contrasting with x-ray diffraction measurements. The expansion is found to result from preferential oxygen vacancy formation in LSMO during STEM sample preparation as determined by electron energy-loss spectroscopy. The La/Sr atom column intensity is also found to oscillate by about 4% between the LSMO and LSCO layers, indicative of La/Sr concentration variation. Using energy-dispersive x-ray spectroscopy in combination with image simulations, we confirm the La/Sr inhomogeneity and elucidate the origin of charge redistribution within the multilayer. These results illuminate the sensitivity of the technique to subtle structural, chemical, and electronic features that can arise to compensate charge imbalances in complex oxide heterostructures.
- Authors:
-
[1];
[1];
[2]
- North Carolina State Univ., Raleigh, NC (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1614936
- Alternate Identifier(s):
- OSTI ID: 1632933
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AIP Advances
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 4; Journal ID: ISSN 2158-3226
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Penn, Aubrey N., Koohfar, Sanaz, Kumah, Divine P., and LeBeau, James M. On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3 MnO3 multilayer thin films. United States: N. p., 2020.
Web. doi:10.1063/1.5140352.
Penn, Aubrey N., Koohfar, Sanaz, Kumah, Divine P., & LeBeau, James M. On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3 MnO3 multilayer thin films. United States. https://doi.org/10.1063/1.5140352
Penn, Aubrey N., Koohfar, Sanaz, Kumah, Divine P., and LeBeau, James M. Thu .
"On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3 MnO3 multilayer thin films". United States. https://doi.org/10.1063/1.5140352. https://www.osti.gov/servlets/purl/1614936.
@article{osti_1614936,
title = {On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3 MnO3 multilayer thin films},
author = {Penn, Aubrey N. and Koohfar, Sanaz and Kumah, Divine P. and LeBeau, James M.},
abstractNote = {The atomic and electronic structures of La0.7Sr0.3MnO3 (LSMO)/La0.7Sr0.3CrO3 (LSCO) multilayer thin films are investigated using aberration corrected scanning transmission electron microscopy (STEM) imaging and spectroscopy. Atomic resolution high angle annular dark-field reveals that LSMO layers have an expanded out-of-plane lattice parameter compared to compressed LSCO layers, contrasting with x-ray diffraction measurements. The expansion is found to result from preferential oxygen vacancy formation in LSMO during STEM sample preparation as determined by electron energy-loss spectroscopy. The La/Sr atom column intensity is also found to oscillate by about 4% between the LSMO and LSCO layers, indicative of La/Sr concentration variation. Using energy-dispersive x-ray spectroscopy in combination with image simulations, we confirm the La/Sr inhomogeneity and elucidate the origin of charge redistribution within the multilayer. These results illuminate the sensitivity of the technique to subtle structural, chemical, and electronic features that can arise to compensate charge imbalances in complex oxide heterostructures.},
doi = {10.1063/1.5140352},
journal = {AIP Advances},
number = 4,
volume = 10,
place = {United States},
year = {Thu Apr 09 00:00:00 EDT 2020},
month = {Thu Apr 09 00:00:00 EDT 2020}
}
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