Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3
Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3
复制标题
SrTiO3 上 K 涂层单晶和双晶胞 FeSe 薄膜的超导二分性
DOI：
10.1103/physrevb.92.180507
复制
发表时间：
2015
影响因子：
3.7
通讯作者：
Xue Qi-Kun
中科院分区：
文献类型：
--
作者：
Tang Chenjia;Zhang Ding;Zang Yunyi;Liu Chong;Zhou Guanyu;Li Zheng;Zheng Cheng;Hu Xiaopeng;Song Canli;Ji Shuaihua;He Ke;Chen Xi;Wang Lili;Ma Xucun;Xue Qi-Kun
本文报道了单胞（1-UC）和2-UC FeSe薄膜在（001）基片上随钾（K）吸附的超导电性演化。通过原位扫描隧道谱的测量，我们发现1-UC FeSe薄膜的超导电性随K覆盖度的增加而不断受到抑制，而非超导的2-UC FeSe薄膜则变为超导，其超导带隙为0，取决于下面的1-UC薄膜是否超导。这项工作明确揭示了FeSe/STO界面在增强1-UC和2-UC FeSe膜中的库珀配对方面发挥着至关重要的作用。
We report the superconductivity evolution of one unit cell (1-UC) and 2-UC FeSe films on(001) substrates with potassium (K) adsorption. Byin situscanning tunneling spectroscopy measurement, we find that the superconductivity in 1-UC FeSe films is continuously suppressed with increasing K coverage, whereas nonsuperconducting 2-UC FeSe films become superconducting with a gap ofordepending on whether the underlying 1-UC films are superconducting or not. This work explicitly reveals that the FeSe/STO interface plays a vital role in enhancing Cooper pairing in both 1-UC and 2-UC FeSe films.