Twinned nanostructure of VO2 thin films grown on r-cut sapphire
Abstract
Due to strong electron-phonon interactions, strain engineering is a powerful tool to control quantum critical phenomena in strongly correlated oxides. Exploring this possibility requires understanding the nanoscale structure of quantum materials and the role it plays in forming the strain landscape. In this work, we used a combination of x-ray nanoimaging and reciprocal space mapping to study the nanostructure of the archetypal Mott insulator VO2 featuring an insulator-to-metal and structural phase transitions. We found that VO2 thin films grown on r-cut sapphire consist of two intertwined crystal lattices, permanently inclined with respect to each other. This persistent pattern of twin domains stands out from the symmetry breaking induced by the structural phase transition and conceivably originates from the post-growth strain relaxation process. We propose a model explaining the formation of twin domains and the emergence of anisotropy in the film nanostructure. Our work suggests using miscut substrates to suppress either one or the other twin that can serve as a new tool to control strain in VO2 films.
- Authors:
-
- Univ. of California San Diego, La Jolla, CA (United States)
- Bar Ilan University, Ramat-Gan, IL (Israel)
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS) and Center for Nanoscale Materials (CNM); Energy Frontier Research Centers (EFRC) (United States). Quantum Materials for Energy-Efficient Neuromorphic Computing (Q-MEENC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Israel Science Foundation (ISF)
- OSTI Identifier:
- 1797973
- Grant/Contract Number:
- AC02-06CH11357; SC0019273; 569/16; SC0001805
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 13; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Shabalin, Anatoly G., Anouchi, Elihu, Hua, Nelson, Wu, Yimin A., Holt, Martin V., Sharoni, Amos, and Shpyrko, Oleg G. Twinned nanostructure of VO2 thin films grown on r-cut sapphire. United States: N. p., 2020.
Web. doi:10.1103/physrevb.102.134106.
Shabalin, Anatoly G., Anouchi, Elihu, Hua, Nelson, Wu, Yimin A., Holt, Martin V., Sharoni, Amos, & Shpyrko, Oleg G. Twinned nanostructure of VO2 thin films grown on r-cut sapphire. United States. https://doi.org/10.1103/physrevb.102.134106
Shabalin, Anatoly G., Anouchi, Elihu, Hua, Nelson, Wu, Yimin A., Holt, Martin V., Sharoni, Amos, and Shpyrko, Oleg G. Mon .
"Twinned nanostructure of VO2 thin films grown on r-cut sapphire". United States. https://doi.org/10.1103/physrevb.102.134106. https://www.osti.gov/servlets/purl/1797973.
@article{osti_1797973,
title = {Twinned nanostructure of VO2 thin films grown on r-cut sapphire},
author = {Shabalin, Anatoly G. and Anouchi, Elihu and Hua, Nelson and Wu, Yimin A. and Holt, Martin V. and Sharoni, Amos and Shpyrko, Oleg G.},
abstractNote = {Due to strong electron-phonon interactions, strain engineering is a powerful tool to control quantum critical phenomena in strongly correlated oxides. Exploring this possibility requires understanding the nanoscale structure of quantum materials and the role it plays in forming the strain landscape. In this work, we used a combination of x-ray nanoimaging and reciprocal space mapping to study the nanostructure of the archetypal Mott insulator VO2 featuring an insulator-to-metal and structural phase transitions. We found that VO2 thin films grown on r-cut sapphire consist of two intertwined crystal lattices, permanently inclined with respect to each other. This persistent pattern of twin domains stands out from the symmetry breaking induced by the structural phase transition and conceivably originates from the post-growth strain relaxation process. We propose a model explaining the formation of twin domains and the emergence of anisotropy in the film nanostructure. Our work suggests using miscut substrates to suppress either one or the other twin that can serve as a new tool to control strain in VO2 films.},
doi = {10.1103/physrevb.102.134106},
journal = {Physical Review B},
number = 13,
volume = 102,
place = {United States},
year = {Mon Oct 12 00:00:00 EDT 2020},
month = {Mon Oct 12 00:00:00 EDT 2020}
}
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