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The Role of SrTiO3 Phonon Penetrating into thin FeSe Films in the Enhancement of Superconductivity

The significant role of interfacial coupling on the superconductivity enhancement in FeSe films on SrTiO3 has been widely recognized. But the explicit origination of this coupling is yet to be identified. Here by surface phonon measurements using high resolution electron energy loss spectroscopy, we found electric field generated by Fuchs-Kliewer (F-K) phonon modes of SrTiO3 can penetrate into FeSe films and strongly interact with electrons therein. The mode-specific electron-phonon coupling (EPC) constant for the ~92 meV F-K phonon is ~0.25 in the single-layer FeSe on SrTiO3. With increasing FeSe thickness, the penetrating field intensity decays exponentially, which matches well the observed exponential decay of the superconducting gap. It is unambiguously shown that the SrTiO3 F-K phonon penetrating into FeSe is essential in the interfacial superconductivity enhancement.

preprint2016arXivOpen access
Shuyuan ZhangJiaqi GuanXun JiaBing LiuWeihua WangFangsen LiLili WangXucun MaQikun XueJiandi ZhangE. W. PlummerXuetao ZhuJiandong Guo
cond-mat.supr-con
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Shuyuan ZhangJiaqi GuanXun JiaBing LiuWeihua WangFangsen LiLili WangXucun MaQikun XueJiandi ZhangE. W. PlummerXuetao ZhuJiandong Guo

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