The research work was supported by the National Natural Science Foundation, the major research plan of the Ministry of Science and Technology and the "2011 Plan" of the Ministry of Education.
Recently, By Ma Xu Cun, a researcher in the Department of Physics of Tsinghua University, Wang Lili, an associate researcher, Chen Xi, a professor, and Ji Shuaihua, an assistant professor, The research team composed of Professor Wang Yayu and academician Xue Qikun took the Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films as an example. The title was published in the journal Chinese Physics Express (chin. phys.lett.31,017401 (2014)). After the article was published, Science magazine in the United States reported this work with the title of "A very thin superconductor" in "Editors’ Choice" (Science 343,230 (2014)), which marked a breakthrough in the research of interface-induced/enhanced high-temperature superconductivity.
On the basis of successfully preparing large-area atomic level flat monoatomic FeSe thin films and FeTe protective layer with sharp interface with FeSe thin films, the research team cooperated with Wang Jian of Peking University, Li Liang of Huazhong University of Science and Technology, Chen Mingwei of Tohoku University, etc., and directly proved the high-temperature superconducting characteristics of single-layer FeSe thin films epitaxial on strontium titanate substrate by using electric transport and magnetic measurement, and its superconducting transition temperature was increased to five times that of bulk FeSe superconducting transition temperature. As shown in Figure (a), the initial transition temperature of superconductivity is above 50 K and reaches zero resistance at 23 K, which is consistent with the transition temperature obtained by diamagnetism measurement in Figure (b). Because the strontium titanate substrate and FeTe protective layer are not superconducting, the system is the thinnest high-temperature superconducting material that has been discovered at present, and its critical current is nearly two orders of magnitude higher than that of bulk FeSe.
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