State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200433, Shanghai, China.
Laboratory of Advanced Materials, Fudan University, 200438, Shanghai, China.
Nat Commun. 2019 Feb 15;10(1):758. doi: 10.1038/s41467-019-08560-z.
At the interface between monolayer FeSe films and SrTiO substrates the superconducting transition temperature (T) is unexpectedly high, triggering a surge of excitement. The mechanism for the T enhancement has been the central question, as it may present a new strategy for seeking out higher T materials. To reveal this enigmatic mechanism, by combining advances in high quality interface growth, O [Formula: see text] O isotope substitution, and extensive data from angle resolved photoemission spectroscopy, we provide striking evidence that the high T in FeSe/SrTiO is the cooperative effect of the intrinsic pairing mechanism in the FeSe and interactions between the FeSe electrons and SrTiO phonons. Furthermore, our results point to the promising prospect that similar cooperation between different Cooper pairing channels may be a general framework to understand and design high-temperature superconductors.
在单层 FeSe 薄膜和 SrTiO 衬底的界面处，超导转变温度 (T) 出人意料地高，引发了一阵兴奋。T 增强的机制一直是核心问题，因为它可能为寻找更高 T 材料提供了一种新策略。为了揭示这一神秘机制，我们通过结合高质量界面生长、O [Formula: see text] O 同位素取代以及角分辨光电子能谱的广泛数据，提供了令人瞩目的证据，表明 FeSe/SrTiO 中的高 T 是 FeSe 中固有配对机制与 FeSe 电子和 SrTiO 声子之间相互作用的协同效应。此外，我们的结果表明，不同 Cooper 配对通道之间的类似合作可能是理解和设计高温超导体的一般框架，这一前景很有希望。
