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Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures |
| Yuan Liu(刘源)1,†, Zhongran Liu(刘中然)2,†, Meng Zhang(张蒙)1, Yanqiu Sun(孙艳秋)1, He Tian(田鹤)2,3, and Yanwu Xie(谢燕武)1,4,‡ |
1 Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device, School of Physics, Zhejiang University, Hangzhou 310027, China;
2 Center of Electron Microscope, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
3 School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China;
4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China |
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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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Received: 07 November 2022
Revised: 07 December 2022
Accepted manuscript online: 16 December 2022
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PACS:
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73.40.-c
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(Electronic transport in interface structures)
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74.25.F-
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(Transport properties)
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81.15.-z
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(Methods of deposition of films and coatings; film growth and epitaxy)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11934016 and 12074334), the Key R&D Program of Zhejiang Province, China (Grant Nos. 2020C01019 and 2021C01002), and the Fundamental Research Funds for the Central Universities of China. |
Corresponding Authors:
Yanwu Xie
E-mail: ywxie@zju.edu.cn
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Cite this article:
Yuan Liu(刘源), Zhongran Liu(刘中然), Meng Zhang(张蒙), Yanqiu Sun(孙艳秋), He Tian(田鹤), and Yanwu Xie(谢燕武) Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures 2023 Chin. Phys. B 32 037305
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