1. Electronic Materials Research Laboratory, Key Laboratory of Ministry of Education & Shaanxi Engineering Research Center of Advanced Energy Materials and Devices, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China
2. Lanzhou Institute of Physics, Lanzhou 730000, P. R. China
3. Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Innovation
Campus, Squires Way, North Wollongong, NSW 2500, Australia