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
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.
(Methods of deposition of films and coatings; film growth and epitaxy)
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.
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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[1]
Strain compensated type II superlattices grown by molecular beam epitaxy Chao Ning(宁超), Tian Yu(于天), Rui-Xuan Sun(孙瑞轩), Shu-Man Liu(刘舒曼), Xiao-Ling Ye(叶小玲), Ning Zhuo(卓宁), Li-Jun Wang(王利军), Jun-Qi Liu(刘俊岐), Jin-Chuan Zhang(张锦川), Shen-Qiang Zhai(翟慎强), and Feng-Qi Liu(刘峰奇). Chin. Phys. B, 2023, 32(4): 046802.
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