Role of the interface on radiation damage in the SrTiO{sub 3}/LaAlO{sub 3} heterostructure under Ne{sup 2+} ion irradiation
- Center for Integrated Nanotechnologies, Materials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
We systematically investigated the microstructural evolution of heteroepitaxial SrTiO{sub 3} (STO) thin films grown on a single crystal LaAlO{sub 3} (LAO) (001) substrate, focusing on the response of the STO/LAO interface to Ne{sup 2+} irradiation at room temperature. Cross sectional transmission electron microscope (TEM) analysis reveals that the LAO crystal amorphizes first after a relatively low dose of damage followed by the amorphization of the STO film after irradiation to a higher dose. While the critical dose to amorphize differs between each material, amorphization begins at the interface and proceeds outward in both cases. Thus, a crystalline/amorphous interface first forms at the STO/LAO interface by a dose of 1 dpa, and then an amorphous/amorphous interface forms when the dose reaches 3 dpa. Scanning TEM and x-ray energy dispersive spectroscopy indicate no significant heavy cation elemental diffusion, though electron energy loss spectroscopy reveals a redistribution of oxygen across the film/substrate interface after Ne{sup 2+} irradiation. Atomistic calculations are used to interpret the experimental findings in terms of the defect properties in each of the two component phases.
- OSTI ID:
- 22271116
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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journal | September 2018 |
Orientation-specific amorphization and intercalated recrystallization at ion-irradiated SrTiO 3 /MgO interfaces
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journal | August 2014 |
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINATES
AMORPHOUS STATE
ATOMIC DISPLACEMENTS
CATIONS
DIFFUSION
ELECTRONS
ENERGY-LOSS SPECTROSCOPY
INTERFACES
IRRADIATION
LANTHANUM OXIDES
MICROSTRUCTURE
MONOCRYSTALS
RADIATION DOSES
STRONTIUM TITANATES
SUBSTRATES
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY