Correlating polar distortions and interfacial charge at the polar/non-polar LaCrO3 /SrTiO3 (001) interface
The relationship between the sheet carrier concentration, ns, of LaCrO3(LCO)/SrTiO3(STO) heterostructures and their structural properties has been investigated. Under low oxygen partial pressure, the STO substrate is reduced during growth as evidenced by a high ns of 1016 cm-2. By controlling the post-growth annealing conditions, heterostructures with ns of 1013-1016 cm-2 are achieved. The atomic-scale structure of the samples is obtained using high-resolution synchrotron X-ray diffraction measurements. For heterostructures with ns at or below 3 × 1013 cm-2, polar distortions are present within the LCO layers and increase in magnitude with a decrease in sheet carrier concentration. These distortions are absent for samples with ns on the order of 1015-1016 cm-2 where interfacial carriers play a role in alleviating the polar discontinuity at the LCO/STO interface. These results suggest that interfacial charge carriers and polar distortions can act as complementary mechanisms to alleviate the polar discontinuity at polar/non-polar complex oxide interfaces.
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- 0906 Electrical and Electronic Engineering
- 0206 Quantum Physics
- 0205 Optical Physics
Citation
Published In
DOI
EISSN
Publication Date
Volume
Issue
Related Subject Headings
- 51 Physical sciences
- 40 Engineering
- 0906 Electrical and Electronic Engineering
- 0206 Quantum Physics
- 0205 Optical Physics