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On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 multilayer thin films

Publication ,  Journal Article
Penn, AN; Koohfar, S; Kumah, DP; Lebeau, JM
Published in: AIP Advances
April 1, 2020

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.

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Published In

AIP Advances

DOI

EISSN

2158-3226

Publication Date

April 1, 2020

Volume

10

Issue

4

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 0906 Electrical and Electronic Engineering
  • 0206 Quantum Physics
  • 0205 Optical Physics
 

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Penn, A. N., Koohfar, S., Kumah, D. P., & Lebeau, J. M. (2020). On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 multilayer thin films. AIP Advances, 10(4). https://doi.org/10.1063/1.5140352
Penn, A. N., S. Koohfar, D. P. Kumah, and J. M. Lebeau. “On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 multilayer thin films.” AIP Advances 10, no. 4 (April 1, 2020). https://doi.org/10.1063/1.5140352.
Penn AN, Koohfar S, Kumah DP, Lebeau JM. On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 multilayer thin films. AIP Advances. 2020 Apr 1;10(4).
Penn, A. N., et al. “On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 multilayer thin films.” AIP Advances, vol. 10, no. 4, Apr. 2020. Scopus, doi:10.1063/1.5140352.
Penn AN, Koohfar S, Kumah DP, Lebeau JM. On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 multilayer thin films. AIP Advances. 2020 Apr 1;10(4).

Published In

AIP Advances

DOI

EISSN

2158-3226

Publication Date

April 1, 2020

Volume

10

Issue

4

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 0906 Electrical and Electronic Engineering
  • 0206 Quantum Physics
  • 0205 Optical Physics