Fig. 4: Interfacial charge transfer and electron–phonon interactions.
From: High temperature superconductivity at FeSe/LaFeO3 interface
a Illustration of the measured Fermi surfaces of 1uc FeSe/LFO/STO. The Fermi surfaces consist of only electron pockets without hole pockets. b Sketch of the work function difference and band bending. c Core level EELS map near Fe L3 edge across the interface for the 1.5uc FeSe/LFO/STO measured in Fig. 1. The dash lines mark the peak positions of the individual EELS spectrum. d High-resolution electron energy loss spectra of the 1.5uc FeSe/LFO/STO, which is compared with the data on 1uc FeSe/STO (Song et al.19). After the total intensity is normalized by the elastic peak, the red line is scaled by a factor of 0.22. e EDCs at M of FeSe/LFO and FeSe/STO, which are integrated over the momentum range indicated by blue box in Fig. 2d. The data of FeSe/STO in panels d and e are reproduced from Song et al. 19. f Sketch of the interfacial interactions which can help enhancing the superconductivity at FeSe/LFO interface.
