Atomically flat superconducting NbN thin films grown on SrTiO3 (111) by plasma-assisted MBE

作者：Wang, Guan-Yong; Zhu, Zhen; Yang, Xin-Yi; Dong, Lu; Ma, Hai-Yang; Sun, Hao-Hua; Li, Ai-Min; Guan, Dan-Dan; Qian, Dong; Liu, Canhua; Li, Yao-Yi^*; Jia, Jin-Feng^*

来源：APL Materials, 2017, 5(12): 126107.

DOI：10.1063/1.5005107

• As-grown films
• Elevated temperature
• Magnetic vortices
• Plasma assisted MBE
• Plasma assisted molecular beam epitaxy
• Situ reflection
• Substrate temperature
• Superconducting gaps

Atomically flat superconducting NbN thin films have been grown on the SrTiO3 (111) substrate by plasma-assisted molecular beam epitaxy for the first time. Using scanning tunneling microscopy and in situ reflection high energy electron diffraction, we investigate the surface structure of epitaxial NbN thin films on the SrTiO3 (111) substrate. The orientation [10 (1) over bar](NbN)//[11 (2) over bar](STO) is dominating at substrate temperature above 700 degrees C. The quality of the as-grown films can be further improved by annealing at elevated temperatures. The homogeneous spatial distribution of superconducting gaps and magnetic vortices further demonstrates the high quality of the NbN films.

• 出版日期2017-12
• 单位上海交通大学