【摘 要】
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The significant role of interfacial coupling on the superconductivity enhancement inFeSe films on SrTiO3 has been widely recognized.But the explicit origination of this coupling isyet to be identified
【机 构】
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中国科学院物理研究所,北京,100190
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The significant role of interfacial coupling on the superconductivity enhancement inFeSe films on SrTiO3 has been widely recognized.But the explicit origination of this coupling isyet to be identified.Here by surface phonon measurements using high resolution electron energyloss spectroscopy,we found electric field generated by Fuchs-Kliewer(F-K)phonon modes ofSrTiO3 can penetrate into FeSe films and strongly interact with electrons therein.Themode-specific electron-phonon coupling(EPC)constant for the～92 meV F-K phonon is～1.0 inthe single-layer FeSe on SrTiO3.With increasing FeSe thickness,the penetrating field intensitydecays exponentially,which matches well the observed exponential decay of the superconductinggap.It is unambiguously shown that the SrTiO3 F-K phonon penetrating into FeSe is essential inthe interfacial superconductivity enhancement.
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