Atomic-Site-Dependent Pairing Gap in Monolayer FeSe/SrTiO3(001)-(â13 × â13).
Nano Lett
; 24(27): 8445-8452, 2024 Jul 10.
Article
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| MEDLINE
| ID: mdl-38917425
ABSTRACT
The interfacial FeSe/TiO2-δ coupling induces high-temperature superconductivity in monolayer FeSe films. Using cryogenic atomically resolved scanning tunneling microscopy/spectroscopy, we obtained atomic-site dependent surface density of states, work function, and the pairing gap in the monolayer FeSe on the SrTiO3(001)-(â13 × â13)-R33.7° surface. Our results disclosed the out-of-plane Se-Fe-Se triple layer gradient variation, switched DOS for Fe sites on and off TiO5â¡, and inequivalent Fe sublattices, which gives global spatial modulation of pairing gap contaminants with the (â13 × â13) pattern. Moreover, the coherent lattice coupling induces strong inversion asymmetry and in-plane anisotropy in the monolayer FeSe, which is demonstrated to correlate with the particle-hole asymmetry in coherence peaks. These results disclose delicate atomic-scale correlations between pairing and lattice-electronic coupling in the Bardeen-Cooper-Schrieffer to Bose-Einstein condensation crossover regime, providing insights into understanding the pairing mechanism of multiorbital superconductivity.
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