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Title: Reconstruction-stabilized epitaxy of LaCoO 3/SrTiO 3 (111) heterostructures by pulsed laser deposition

Abstract

Unlike widely explored complex oxide heterostructures grown along [001], the study of [111]-oriented heterointerfaces is very limited thus far. One of the main challenges is to overcome the polar discontinuity that hinders the epitaxy of atomically sharp interfaces. Here, by taking LaCoO 3/SrTiO 3(111) as a prototype, we show that the reconstruction, which effectively compensates the surface polarity, can stabilize the epitaxy of the heterostructure with polar discontinuity. A reconstructed substrate surface is prepared, while the growth is controlled to form reconstruction on the film surface. To suppress the chemical diffusion across the interface, the growth is interrupted between each unit cell layer to allow the lattice relaxation at a lowered temperature. In this way, high quality two-dimensional growth is realized and the heterointerfaces exhibit sharpness at the atomic scale. As a result, our work provides a path to precisely control the growth of complex oxide heterostructures along polar orientations that exhibit emergent quantum phenomena.

Authors:
 [1];  [1];  [2];  [1];  [3];  [3];  [3];  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  3. Rutgers Univ., Piscataway, NJ (United States)
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1503638
Alternate Identifier(s):
OSTI ID: 1417520
Grant/Contract Number:  
SC0012375
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 3; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Hu, Minhui, Zhang, Qinghua, Gu, Lin, Guo, Qinlin, Cao, Yanwei, Kareev, M., Chakhalian, J., and Guo, Jiandong. Reconstruction-stabilized epitaxy of LaCoO3/SrTiO3 (111) heterostructures by pulsed laser deposition. United States: N. p., 2018. Web. doi:10.1063/1.5006298.
Hu, Minhui, Zhang, Qinghua, Gu, Lin, Guo, Qinlin, Cao, Yanwei, Kareev, M., Chakhalian, J., & Guo, Jiandong. Reconstruction-stabilized epitaxy of LaCoO3/SrTiO3 (111) heterostructures by pulsed laser deposition. United States. doi:10.1063/1.5006298.
Hu, Minhui, Zhang, Qinghua, Gu, Lin, Guo, Qinlin, Cao, Yanwei, Kareev, M., Chakhalian, J., and Guo, Jiandong. Fri . "Reconstruction-stabilized epitaxy of LaCoO3/SrTiO3 (111) heterostructures by pulsed laser deposition". United States. doi:10.1063/1.5006298. https://www.osti.gov/servlets/purl/1503638.
@article{osti_1503638,
title = {Reconstruction-stabilized epitaxy of LaCoO3/SrTiO3 (111) heterostructures by pulsed laser deposition},
author = {Hu, Minhui and Zhang, Qinghua and Gu, Lin and Guo, Qinlin and Cao, Yanwei and Kareev, M. and Chakhalian, J. and Guo, Jiandong},
abstractNote = {Unlike widely explored complex oxide heterostructures grown along [001], the study of [111]-oriented heterointerfaces is very limited thus far. One of the main challenges is to overcome the polar discontinuity that hinders the epitaxy of atomically sharp interfaces. Here, by taking LaCoO3/SrTiO3(111) as a prototype, we show that the reconstruction, which effectively compensates the surface polarity, can stabilize the epitaxy of the heterostructure with polar discontinuity. A reconstructed substrate surface is prepared, while the growth is controlled to form reconstruction on the film surface. To suppress the chemical diffusion across the interface, the growth is interrupted between each unit cell layer to allow the lattice relaxation at a lowered temperature. In this way, high quality two-dimensional growth is realized and the heterointerfaces exhibit sharpness at the atomic scale. As a result, our work provides a path to precisely control the growth of complex oxide heterostructures along polar orientations that exhibit emergent quantum phenomena.},
doi = {10.1063/1.5006298},
journal = {Applied Physics Letters},
number = 3,
volume = 112,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Crystal structure and schematic of polar discontinuity of the LCO/STO(111) heterointerface. (b) In situ RHEED patterns of the as received STO(111) substrate, treated STO(111), and LCO(111) film. All RHEED patterns have been recorded along the $1\bar{2}1$ direction of the samples. The arrows indicate the 5/6 and 1/2more » fractional patterns of the reconstructions, respectively. (c) Evolution of the RHEED intensity during the interrupted deposition of the LCO(111) film. Only a part of the growth is shown. (d) AFM images (2 μm × 2 μm) and according line profiles of both the treated STO(111) substrate and LCO film surfaces. (e) Sheet resistance of the LCO thin film as a function of temperature, exhibiting highly insulating characteristics, which is consistent with the previous reported.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.