Alleviating polarity-conflict at the heterointerfaces of KTaO3/GdScO3polar complex-oxides

J. Thompson; J. Hwang; J. Nichols; J. G. Connell; S. Stemmer; S. S.A. Seo

doi:10.1063/1.4895392

Alleviating polarity-conflict at the heterointerfaces of KTaO₃/GdScO₃polar complex-oxides

J. Thompson, J. Hwang, J. Nichols, J. G. Connell, S. Stemmer, S. S.A. Seo

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

14 Scopus citations

Abstract

We have synthesized and investigated the heterointerfaces of KTaO₃(KTO) and GdScO₃(GSO), which are both polar complex-oxides along the pseudo-cubic [001] direction. Since their layers have the same, conflicting net charges at interfaces, i.e., KO(-1)/ScO₂(-1) or TaO₂(+1)/GdO(+1), forming the heterointerface of KTO/GSO should be forbidden due to strong Coulomb repulsion, the so-called polarity conflict. However, we have discovered that atomic reconstruction occurs at the heterointerfaces between KTO thin-films and GSO substrates, which effectively alleviates the polarity conflict without destroying the hetero-epitaxy. Our result demonstrates one of the important ways to create artificial heterostructures from polar complex-oxides.

Original language	English
Article number	102901
Journal	Applied Physics Letters
Volume	105
Issue number	10
DOIs	https://doi.org/10.1063/1.4895392
State	Published - Sep 8 2014

Bibliographical note

Publisher Copyright:
© 2014 AIP Publishing LLC.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.4895392

Cite this

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title = "Alleviating polarity-conflict at the heterointerfaces of KTaO3/GdScO3polar complex-oxides",

abstract = "We have synthesized and investigated the heterointerfaces of KTaO3(KTO) and GdScO3(GSO), which are both polar complex-oxides along the pseudo-cubic [001] direction. Since their layers have the same, conflicting net charges at interfaces, i.e., KO(-1)/ScO2(-1) or TaO2(+1)/GdO(+1), forming the heterointerface of KTO/GSO should be forbidden due to strong Coulomb repulsion, the so-called polarity conflict. However, we have discovered that atomic reconstruction occurs at the heterointerfaces between KTO thin-films and GSO substrates, which effectively alleviates the polarity conflict without destroying the hetero-epitaxy. Our result demonstrates one of the important ways to create artificial heterostructures from polar complex-oxides.",

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T1 - Alleviating polarity-conflict at the heterointerfaces of KTaO3/GdScO3polar complex-oxides

AU - Thompson, J.

AU - Hwang, J.

AU - Nichols, J.

AU - Connell, J. G.

AU - Stemmer, S.

AU - Seo, S. S.A.

PY - 2014/9/8

Y1 - 2014/9/8

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AB - We have synthesized and investigated the heterointerfaces of KTaO3(KTO) and GdScO3(GSO), which are both polar complex-oxides along the pseudo-cubic [001] direction. Since their layers have the same, conflicting net charges at interfaces, i.e., KO(-1)/ScO2(-1) or TaO2(+1)/GdO(+1), forming the heterointerface of KTO/GSO should be forbidden due to strong Coulomb repulsion, the so-called polarity conflict. However, we have discovered that atomic reconstruction occurs at the heterointerfaces between KTO thin-films and GSO substrates, which effectively alleviates the polarity conflict without destroying the hetero-epitaxy. Our result demonstrates one of the important ways to create artificial heterostructures from polar complex-oxides.

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