Tunable conductivity at LaAlO3/SrxCa 1-xTiO3 (0 ≤ x ≤ 1) heterointerfaces

Young Seon Moon, Dai Hong Kim, Jung Hye Chang, Jong Kwon Choi, Chong Yun Kang, Jin Heon Choi, Seong Hyeon Hong, Seung Hyub Baek, Jin Sang Kim, Ho Won Jang

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Abstract

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.

Original languageEnglish
Article number012903
JournalApplied Physics Letters
Volume102
Issue number1
DOIs
Publication statusPublished - 2013 Jan 7
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Moon, Y. S., Kim, D. H., Chang, J. H., Kwon Choi, J., Kang, C. Y., Choi, J. H., Hong, S. H., Baek, S. H., Kim, J. S., & Jang, H. W. (2013). Tunable conductivity at LaAlO3/SrxCa 1-xTiO3 (0 ≤ x ≤ 1) heterointerfaces. Applied Physics Letters, 102(1), [012903]. https://doi.org/10.1063/1.4773986