Superconducting transition of FeSe/SrTiO3 induced by adsorption of semiconducting organic molecules
Superconducting transition of FeSe/SrTiO3 induced by adsorption of semiconducting organic molecules
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半导体有机分子吸附诱导 FeSe/SrTiO3 超导转变
DOI：
10.1103/physrevb.95.205405
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发表时间：
2017
影响因子：
3.7
通讯作者：
ong
中科院分区：
文献类型：
--
作者：
Guan Jiaqi;Liu Jian;Liu Bing;Huang Xiaochun;Zhu Qing;Zhu Xuetao;Sun Jiatao;Meng Sheng;Wang Weihua;Guo Ji;ong
我们在衬底上制备了FeSe/STO超导和非超导薄膜，用低温扫描隧道显微镜和光谱研究了有机分子与FeSe层之间的电荷转移引起的超导转变。在低覆盖率，施主和受主型分子优先吸附在非超导和超导FeSe层，分别。在非超导FeSe层上，施主分子诱导超导电性，而在受主分子附近，超导电性被抑制。利用扫描隧道显微镜分析了电子态和功函数的演化。这些结果说明了局域电子浓度在FeSe/STO超导转变中所起的重要作用。
We prepared superconducting and nonsuperconducting FeSe films onsubstrates (FeSe/STO) and investigated the superconducting transition induced by charge transfer between organic molecules and FeSe layers by low temperature scanning tunneling microscopy and spectroscopy. At low coverage, donor- and acceptor-type molecules adsorbed preferentially on the nonsuperconducting and superconducting FeSe layers, respectively. Superconductivity was induced by donor molecules on nonsuperconducting FeSe layer, while the superconductivity was suppressed near acceptor molecules. The corresponding evolutions of electronic states and work function were also resolved by scanning tunneling microscopy. These results illustrate the important role played by local electron concentration in the superconducting transition of FeSe/STO.