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arXiv · 0704.1050

Electrical transport properties of polar heterointerface between KTaO3 and SrTiO3

A. Kalabukhov·R. Gunnarsson·T. Claeson·D. Winkler
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Abstract

Electrical transport of a polar heterointerface between two insulating perovskites, KTaO3 and SrTiO3, is studied. It is formed between a thin KTaO3 film deposited on a top of TiO2- terminated (100) SrTiO3 substrate. The resulting (KO)1-(TiO2)0 heterointerface is expected to be hole-doped according to formal valences of K (1+) and Ti (4+). We observed electrical conductivity and mobility in the KTaO3/SrTiO3 similar to values measured earlier in electron-doped LaAlO3/SrTiO3 heterointerfaces. However, the sign of the charge carriers in KTaO3/SrTiO3 obtained from the Hall measurements is negative. The result is an important clue to the true origin of the doping at perovskite oxide hetero-interfaces.

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A. Kalabukhov, R. Gunnarsson, T. Claeson, D. Winkler. 2007-04-09. Electrical transport properties of polar heterointerface between KTaO3 and SrTiO3. https://arxiv.org/abs/0704.1050

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