Alleviating polarity-conflict at the heterointerfaces of KTaO$_3$/GdScO$_3$ polar complex-oxides

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

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arxiv 1401.8225 v2 pith:NYMMF7V6 submitted 2014-01-31 cond-mat.mtrl-sci cond-mat.mes-hall

Alleviating polarity-conflict at the heterointerfaces of KTaO₃/GdScO₃ polar complex-oxides

J. Thompson , J. Hwang , J. Nichols , J. G. Connell , S. Stemmer , S. S. A. Seo This is my paper

classification cond-mat.mtrl-sci cond-mat.mes-hall

keywords complex-oxidesheterointerfacespolarconflictgdscoktaopolarityalleviates

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We have synthesized and investigated the heterointerfaces of KTaO$_3$ (KTO) and GdScO$_3$ (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)/ScO$_2$(-1) or TaO$_2$(+1)/GdO(+1), forming the heterointerface of KTO/GSO should be forbidden due to strong Coulomb repulsion, the so-called $\textit{polarity conflict}$. 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.

Alleviating polarity-conflict at the heterointerfaces of KTaO₃/GdScO₃ polar complex-oxides

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