1Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China.
2Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA.
3Department of Physics and Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston, Houston, TX 77204, USA.
Correspondence to: Prof. Zhifeng Ren, Department of Physics and Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston, Houston, TX 77204, USA. E-mail:
zhifengren2013@gmail.com
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