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arXiv · 2208.05712

Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures

Yuan Liu·Zhongran Liu·Meng Zhang·Yanqiu Sun·He Tian·Yanwu Xie
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Abstract

Complex oxide heterointerfaces can host a rich of emergent phenomena, and epitaxial growth is usually at the heart of forming these interfaces. Recently, a strong crystalline-orientation-dependent two-dimensional superconductivity was discovered at interfaces between KTaO3 single-crystal substrates and films of other oxides. Unexpectedly, rare of these oxide films was epitaxially grown. Here, we report the existence of superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures, with a superconducting transition temperature of ~0.5 K. Meanwhile, no superconductivity was detected in the (001)- and (110)-orientated LaVO3/KTaO3 heterostructures down to 50 mK. Moreover, we find that for the LaVO3/KTaO3(111) interfaces to be conducting, an oxygen-deficient growth environment and a minimum LaVO3 thickness of ~0.8 nm (~ 2 unit cells) are needed.

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Yuan Liu, Zhongran Liu, Meng Zhang, Yanqiu Sun, He Tian, Yanwu Xie. 2022-08-11. Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures. https://doi.org/10.1088/1674-1056%2Facac1b

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