The two-dimensional electron gas formed at LaAlO3/SrTiO 3 heterointerfaces exhibits a variety of interesting physical properties. Herein, we report on tunable conductivity at LaAlO 3/SrxCa1-xTiO3 heterostructures. By changing the Sr content in the SrxCa1-xTiO3 (0 ≤ x ≤ 1) layers, the orthorhombicity of the films, which inevitably accompanies TiO6 octahedral distortions in the unit cells, could be varied. As a result, the interfacial conductivity can be tuned over 6 orders of magnitude. We suggest that the use of pseudosubstrates with chemical substitution or alloying is a promising route to finely tune conductivity at oxide heterointerfaces.
Bibliographical noteFunding Information:
This work was financially supported by KIST research programs (Grant Nos. 2E22731 and 2V02530). H.W.J. acknowledges the financial support of the National Research Foundation of Korea Grant funded by the Korean Government (NRF-2012-M3C1A1-048860).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)