2019 journal article
Growth-temperature dependence of conductivity at the LaCrO3/SrTiO3 (001) interface
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, 37(2).
open access via arxiv.org (repository)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(Web of Science)
Source: Web Of Science
Added: March 25, 2019
The effect of growth conditions and postgrowth treatment on the structural and electronic properties of the polar/nonpolar LaCrO3/SrTiO3 (LCO/STO) interface has been investigated. Under low oxygen partial pressure, oxygen vacancies are formed in the STO substrate resulting in metallicity with a measured sheet carrier concentration of 1016cm−−2. Annealing postgrowth in flowing oxygen causes the sheet carrier concentration to saturate to 1013cm−−2, which is consistent with the reported values of a two-dimensional gas at other polar/STO interfaces. However, growth under nonreducing growth conditions leads to insulating behavior. High-resolution synchrotron x-ray-based structural determination of the atomic-scale structures of both metallic and insulating LCO/STO interfaces shows chemical intermixing and an interfacial lattice expansion.