Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO_(3)  

作　　者：WANG Qing-Yan LI Zhi ZHANG Wen-Hao ZHANG Zuo-Cheng ZHANG Jin-Song LI Wei DING Hao OU Yun-Bo DENG Peng CHANG Kai WEN Jing SONG Can-Li HE Ke JIA Jin-Feng JI Shuai-Hua WANG Ya-Yu WANG Li-Li CHEN Xi MA Xu-Cun XUE Qi-Kun 王庆艳;李志;张文号;张祚成;张金松;李渭;丁浩;欧云波;邓鹏;常凯;文竞;宋灿立;何珂;贾金锋;季帅华;王亚愚;王立莉;陈曦;马旭村;薛其坤(State Key Lab of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084;Institute of Physics,Chinese Academy of Sciences,Beijing 100190)

机构地区：[1]State Key Lab of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084 [2]Institute of Physics,Chinese Academy of Sciences,Beijing 100190

出　　处：《Chinese Physics Letters》2012年第3期204-207,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10721404 and 11134008;the National Basic Research Program of China under Grant No 2009CB929400.

摘　　要：We report high transition temperature superconductivity in one unit-cell(UC)thick FeSe films grown on a Seetched SrTiO_(3)(001)substrate by molecular beam epitaxy(MBE).A superconducting gap as large as 20 meV and the magnetic field induced vortex state revealed by in situ scanning tunneling microscopy(STM)suggest that the superconductivity of the 1 UC FeSe films could occur around 77K.The control transport measurement shows that the onset superconductivity temperature is well above 50K.Our work not only demonstrates a powerful way for finding new superconductors and for raising Tc,but also provides a well-defined platform for systematic studies of the mechanism of unconventional superconductivity by using different superconducting materials and substrates.

关 键 词：SUPERCONDUCTIVITY SrTiO_(3) vortex 

分 类 号：O51[理学—低温物理]