Exploring the Spatial Control of Topotactic Phase Transitions Using Vertically Oriented Epitaxial Interfaces
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Chinese Academy of Sciences (CAS), Ningbo (China). Ningbo Inst. of Materials Technology and Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
AbstractEngineering oxygen vacancy formation and distribution is a powerful route for controlling the oxygen sublattice evolution that affects diverse functional behavior. The controlling of the oxygen vacancy formation process is particularly important for inducing topotactic phase transitions that occur by transformation of the oxygen sublattice. Here we demonstrate an epitaxial nanocomposite approach for exploring the spatial control of topotactic phase transition from a pristine perovskite phase to an oxygen vacancy-ordered brownmillerite (BM) phase in a model oxide La0.7Sr0.3MnO3 (LSMO). Incorporating a minority phase NiO in LSMO films creates ultrahigh density of vertically aligned epitaxial interfaces that strongly influence the oxygen vacancy formation and distribution in LSMO. Combined structural characterizations reveal strong interactions between NiO and LSMO across the epitaxial interfaces leading to a topotactic phase transition in LSMO accompanied by significant morphology evolution in NiO. Using the NiO nominal ratio as a single control parameter, we obtain intermediate topotactic nanostructures with distinct distribution of the transformed LSMO-BM phase, which enables systematic tuning of magnetic and electrical transport properties. The use of self-assembled heterostructure interfaces by the epitaxial nanocomposite platform enables more versatile design of topotactic phase structures and correlated functionalities that are sensitive to oxygen vacancies.
- Research Organization:
- Univ. of California, San Diego, CA (United States). Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C) (EFRC); Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0019273; SC0012704; AC05-00OR22725
- OSTI ID:
- 1836653
- Alternate ID(s):
- OSTI ID: 1838157; OSTI ID: 1841473
- Report Number(s):
- BNL-222556-2021-JAAM
- Journal Information:
- Nano-Micro Letters, Vol. 14, Issue 1; ISSN 2311-6706
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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