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

doi:10.1063/1.4773986

Tunable conductivity at LaAlO₃/Sr_xCa _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

KU-KIST Graduate School of Converging Science and Technology

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

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/Sr_xCa_1-xTiO₃ heterostructures. By changing the Sr content in the Sr_xCa_1-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 language	English
Article number	012903
Journal	Applied Physics Letters
Volume	102
Issue number	1
DOIs	https://doi.org/10.1063/1.4773986
Publication status	Published - 2013 Jan 7

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Tunable conductivity at LaAlO3/SrxCa 1-xTiO3 (0 ≤ x ≤ 1) heterointerfaces",

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.",

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

note = "Funding 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).",

year = "2013",

month = jan,

day = "7",

doi = "10.1063/1.4773986",

language = "English",

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journal = "Applied Physics Letters",

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AU - Moon, Young Seon

AU - Kim, Dai Hong

AU - Chang, Jung Hye

AU - Kwon Choi, Jong

AU - Kang, Chong Yun

AU - Choi, Jin Heon

AU - Hong, Seong Hyeon

AU - Baek, Seung Hyub

AU - Kim, Jin Sang

AU - Jang, Ho Won

N1 - Funding 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).

PY - 2013/1/7

Y1 - 2013/1/7

N2 - 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.

AB - 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.

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Tunable conductivity at LaAlO₃/Sr_xCa _1-xTiO₃ (0 ≤ x ≤ 1) heterointerfaces

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